This rock, called “Máaz” (the Navajo word for “Mars”), is the first feature of scientific interest to be studied by NASA’s Perseverance Mars rover.
Credit: NASA/JPL-Caltech

When you’re exploring a planet, you have to name things. It’s a great way to memorialize your discoveries, but it also prevents confusion: are you going to study This Rock, That Rock, or The Other Rock?

The United States National Aeronautics and Space Administration (NASA) mission Mars 2020 is hard at work exploring Mars. The mission’s rover, Perseverance, landed on Feb. 18, 2021, in Jezero Crater. The mission planners have been naming important surface features in the Navajo language. This decision wasn’t planned before the rover landed, but came about by happy circumstance.

Landing on another solar system body is tough. Mission planners can guide a lander to a general destination, but they cannot pinpoint an exact landing site. Mars 2020 mission planners could guide Perseverance to Jezero Crater, but they could not know where in the 28-mile (45-kilometer) wide crater the rover was going to land. Therefore, mission planners studied the entire crater to prepare for landing. They divided the crater into several sections, naming each after a place on Earth—including U.S. national monuments—that the section resembled in some way.

Perseverance landed within the section that planners had named after Canyon de Chelly National Monument. This national monument, known for its huge, colorful, steep-walled canyons, lies entirely within the Navajo reservation. The Navajo are one of the largest Native American groups in the United States. The Navajo reservation, which covers 16 million acres (6.5 million hectares), is the nation’s biggest reservation. It includes parts of Arizona, New Mexico, and Utah.

Canyon de Chelly National Monument (“Tséyi’” in Navajo) in Arizona is located on Navajo Nation land. Members of NASA’s Perseverance rover team, in collaboration with the Navajo Nation, has been naming features of scientific interest with words in the Navajo language.
Credit: NASA/JPL-Caltech

NASA’s Mars mission scientists informally name important features to make them easier to identify. Mars 2020 mission scientists were inspired by the name of their landing site to nickname features in the Navajo language. They teamed up with NASA Jet Propulsion Laboratory (JPL) scientist Aaron Yazzie, who is Navajo, to seek permission from the Navajo Nation. The nation’s government approved the idea and developed a list of potential names. The first name to be used was Máaz, the Navajo word for Mars, for a rock near the landing site. Navajo officials also included the translation for Perseverance: Ha’ahóni.

Perseverance has to be “taught” the language, since the computer languages the rover uses cannot process the special characters and diacritical marks used in the written Navajo language. Mars 2020 team members are working to develop better transliterations using the English alphabet.

This is not the first time the Navajo language has played an outsized role in United States history. During the United States’ involvement in World War II (1939-1945), Navajo radio operators sent secret messages using a code based on the Navajo language. At the time, Navajo was an unwritten language known to few people outside of the Navajo Nation. Its complex structure, difficult pronunciation, and singsong qualities made it nearly impossible to decipher. Although Imperial Japanese forces could overhear the messages, they never managed to decode them. The Navajo radio operators, called code talkers, have been honored for their service in the war.

Mars 2020 has shed its proverbial training wheels and is breaking new ground in the exploration of the Red Planet. The helicopter Ingenuity, another part of the mission, conducted its first flight on April 19. Engineers are now pushing Ingenuity further, conducting longer, more challenging flights. The craft’s performance will gather valuable information for future Mars flyers. Perseverance’s robotic arm began conducting science on May 11. As the mission continues to explore, planners will continue to nickname features in the Navajo language—a tribute to the Navajo people, their culture, and the land they call home.

NASA’s Mars 2020 rover Perseverance
Credit: NASA/JPL-Caltech

Mars is one of the most difficult destinations to arrive safely at in the solar system, but you might not know it if you have been paying attention to the news lately. Earthlings are a perfect three-for-three on Mars missions this February. Two countries saw their first missions ever arrive at the Red Planet last week. Then yesterday, the United States National Aeronautics and Space Administration (NASA) landed the Mars 2020 rover Perseverance on the surface of Mars. This flotilla of missions to the Red Planet was facilitated by a favorable alignment in the middle of 2020 that brought the planet close to Earth.

On February 9, a spacecraft from the United Arab Emirates (UAE) arrived in orbit around Mars. The orbiter, called Hope or Amal, will map Martian weather on a planet-wide scale. Such mapping has never been attempted before. UAE became just the fifth country to reach the planet. All systems look good at the moment, but Hope is due to enter the orbit from which it will conduct its mapping in May. At that point, engineers will know for sure if the probe will be able to accomplish its mission.

Hot on Hope’s heels was an ambitious mission sent by the China National Space Administration (CNSA). The mission, called Tianwen-1, went into orbit around Mars the next day. The mission consists of an orbiter, a lander, and a rover. The lander and rover will attempt a landing in a few months. If CNSA successfully deploys Tianwen-1, China will become the third country to land a spacecraft on Mars and just the second to land a rover on Mars.

The last—but certainly not least—to arrive was Perseverance. The rocket carrying the beefy rover blasted off from Cape Canaveral in Florida on July, 30, 2020. Perseverance is the largest rover ever sent to Mars. It’s the size of a small automobile and weighs over 2,200 pounds (1,000 kilograms) on Earth.

Unlike China and the UAE, the United States is a Mars veteran. NASA has landed several successful missions there, including the still-operational sibling craft of Perseverance, the Mars Science Laboratory (MSL) rover Curiosity.

The design of Perseverance is based on that of Curiosity, which has been exploring Mars since 2012. Engineers used many extra components that were originally created as backups for Curiosity in case of manufacturing defects in the originals. But Perseverance is more than just a pile of spare parts. Jet Propulsion Laboratory (JPL) scientists and engineers modified—and beefed up—the design to fit Perseverance’s mission. Perseverance is about 5 inches (13 centimeters) longer and 278 pounds (126 kilograms) heavier than Curiosity.

No matter how many successful missions are under a space agency’s belt, getting a spacecraft to Mars is a heart-pounding ordeal. Landing on the Red Planet is especially challenging. Mars is a large planet, so its gravity pulls spacecraft towards it at high speed. It lacks a thick atmosphere like that of Earth, however, that spacecraft could use to slow down. Furthermore, retrorockets placed on the rover would scour the ground near the landing site and contaminate it with rocket exhaust.

JPL has developed a complex of system to land a large rover on the Martian surface, which was first used with MSL. A parachute slowed the craft after it entered the Martian atmosphere. A set of rockets then fired to hover the craft above the surface. Then, Perseverance was lowered to the ground on a tether. Mission planners call this complicated ride through the atmosphere, filled with opportunities for mission-ending disaster, “the seven minutes of terror.”

Perseverance touched down in Jezero Crater. Billions of years ago, the crater held a lake that was fed by a river system. Perseverance will explore this ancient river delta and search for signs of past life there.

Perseverance carries many sophisticated scientific instruments that will enable it study the geology and climate of the region. The rover is equipped with a special drill and sample vials. After studying the rock samples it has drilled, it will place them in sealed vials and cache (stow) them on the surface. Scientists hope to recover the cached vials and send them to Earth in an ambitious sample return mission in a decade or so.

Other special features included an upgraded autonomous driving package, which will enable Perseverance to pick its way through obstacles on its own to reach a target, and a small helicopter drone called Ingenuity that will look to demonstrate the first powered flight on a solar system body other than Earth. Expect to hear about more exciting discoveries—and see more stunning pictures of Mars—in the months and years ahead.

May 20, 2019

What do you call an earthquake on Mars? A marsquake! For the first time, scientists working with the United States National Aeronautics and Space Administration (NASA) think they have detected an actual temblor on the red planet.

Scientists think they have detected marsquakes on Mars, the fourth planet from the sun. Credit: NASA/JPL/Malin Space Science Systems

At the end of 2018, NASA’s InSight probe deployed a specially-built seismometer called Seismic Experiment for Interior Structure (SEIS) to the surface of Mars. (InSight is short for Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport. InSight launched from Earth in May 2018 and landed on Mars in late November.) On April 6, 2019, SEIS picked up faint vibrations that were not caused by wind or the movement of InSight’s robotic arm. The signal was faint, with a low-level magnitude between 1 and 2 on the Richter scale. On Earth, such a weak quake would go unnoticed. On Mars, however, InSight was there to feel it.

Mars is the third body on which humans have recorded seismic activity, after Earth and the moon. On Earth, quakes are caused by the bending and grinding of huge tectonic plates, which float on layers of soft rock and magma and hold the planet’s oceans and continents. Mars does not have tectonic plates. Marsquakes are likely caused by the shrinking of the planet’s interior, which itself is caused by the slow cooling of its core.

NASA’s InSight probe has been studying the surface of Mars since late November 2018. Credit: NASA/JPL-Caltech

While detecting marsquakes is exciting, readings from SEIS might also shed light on the structure of the red planet. Scientists have reason to think that Mars, like Earth, has an interior composed of a rocky outer crust, a soft mantle, a liquid outer core, and a solid inner core. But they do not know how thick each of the layers are. Seismic waves change direction slightly when passing through core layers. If scientists know the source of the seismic waves, they can get an idea of the kinds and sizes of layers the waves had to pass through to reach the seismometer. Scientists can then create a more accurate map of the Martian interior and gain insight into the structure of all rocky planets—including those in our solar system and those orbiting stars millions of light-years away.

InSight has many instruments in addition to SEIS. The probe also serves as the only weather station on another planet. Sensors track the brisk wind gusts, low pressures, and frigid temperatures of Elysium Planitia, a vast plain near the Martian equator. On May 11, the temperature climbed to -4 °F (-20 °C) during the day, but plummeted to -148 °F (-100 °C) during the Martian night. Wind speeds topped out at 32 miles (51 kilometers) per hour.

April 8, 2019

After nearly 15 years on the surface of Mars, the Opportunity rover died as it lived: studying its adopted home planet. The United States National Aeronautics and Space Administration (NASA) officially ended the rover’s mission in February 2019, months after the craft was silenced by a dust storm.

The NASA Mars rover Opportunity studied the red planet from January 2004 until the summer of 2018. Credit: NASA/JPL/Cornell University, Maas Digital LLC

Opportunity and its twin vehicle, Spirit, together made up the Mars Exploration Rover Mission. They were launched in 2003 to study the history of water on the red planet. The golf-cart-sized rovers carried scientific instruments created by teams of scientists and engineers from the United States and Europe.

Spirit and Opportunity were each designed for just 90-day missions. But both continued to gather information on the surface of Mars without any major setbacks for more than five years. In early 2009, Spirit became permanently trapped in a bed of loose Martian soil, ending that rover’s exploring career. Finally accepting its loss, NASA officially ended Spirit’s mission in 2011.

Opportunity landed in January 2004 in Meridiani Planum, a broad plain on the surface of Mars. Planners chose the site because it was known to contain hematite. Hematite is an iron-bearing mineral. On Earth, hematite generally forms in the presence of water. In 2013, Opportunity detected certain clay minerals that form only in the presence of water. This discovery was proof that liquid water once existed on the surface of Mars. This finding was confirmed by other Mars missions, such as NASA’s larger Curiosity rover, sent to Mars in 2011. Opportunity went on to learn that the water was similar to bodies of water on Earth, allowing for the possibility of life on Mars.

Huge dust storms occasionally blanket the surface of Mars. A particularly intense storm occurred in mid-2018, causing NASA to lose contact with Opportunity. The dust blocked out the sun and covered the rover’s solar panels, making it impossible for Opportunity to keep its core systems warm. Even after the skies cleared, there was no response from the rover. The bitterly cold temperatures on Mars—about -80 °F (-60 °C) on average—can damage and destroy electronics.

The end of Opportunity is not the end of humankind’s robotic presence on Mars. Curiosity continues to roll along. InSight, a non-mobile lander also launched by NASA, is currently studying the interior structure of Mars. And in 2021, two new rovers will launch: NASA’s Mars 2020 rover and Rosalind Franklin, a rover developed by the European Space Agency (ESA) and Russia’s state space agency, Roscosmos. (Rosalind Franklin was a British chemist famous for her studies of molecules and crystals.) The new rovers will try to find out if Mars held life at some point in its distant past. Thanks to the hard work of Opportunity and the mission’s engineers and scientists, we know it is a possibility.

September 10, 2018

One planet in our solar system might be a little wetter than we previously thought. A team of Italian scientists recently found evidence that a lake of liquid water most likely exists on Mars, buried deep beneath the planet’s southern polar ice cap. The team published its findings on July 25, 2018, in the journal Science.

Italian scientists recently found evidence of what they believe to be a liquid water lake beneath the southern polar ice cap of Mars, the fourth planet from the sun. Credit: NASA/JPL/Malin Space Science Systems

Mars is a very cold place. On average, the surface of the planet is about -80 °F (-60 °C). As on Earth, however, the poles are even colder. Both poles of Mars feature permanent caps of water ice that are more than 1 mile (1.6 kilometers) thick. In addition, the southern cap has a roughly 25-foot (8-meter) thick permanent covering of frozen carbon dioxide. The northern cap has a diameter of about 625 miles (1,000 kilometers), and the southern cap has a diameter of about 220 miles (350 kilometers). In the Martian winter, the caps expand as layers of carbon dioxide frost condense from the atmosphere.

Images such as this one, showing curved depressions in Mars’s Utopia Planitia region, prompted the search for subterranean water with ground-penetrating radar. Credit: NASA/JPL-Caltech/Univ. of Arizona

The team of scientists analyzed data from the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS), an instrument aboard the European Space Agency (ESA) probe Mars Express. Mars Express has been studying the surface of Mars since 2004. MARSIS is a ground-penetrating radar device. Ground-penetrating radar can detect underground features and objects beneath rock and ice. The radar waves reflect off liquid water, however, and for years MARSIS has returned many images with this tell-tale reflection beneath the planet’s south pole. At last, after ruling out other possibilities, the scientists concluded that the radar had found a triangular lake basin about 12 miles (19 kilometers) wide and 1 mile (1.6 kilometers) deep.

The Martian lake might be similar to Lake Vostok and other subglacial lakes on Earth. Lake Vostok, the largest lake in Antarctica, lies beneath 2.5 miles (4 kilometers) of ice, has been isolated for 35 million years, and has temperatures below the normal freezing point of water. But life still likely exists there. If life exists on Mars, it could likely be found in such subglacial lakes. The odds of finding life there are still long, however. The Martian lake would be dozens of degrees below the normal freezing point of water and filled with salts toxic to life on Earth.

As scientists pinch and probe Mars for life, they are also eager to search for life beneath other planetary ice in our solar system. Europa and Enceladus, moons of Jupiter and Saturn, have warm oceans beneath their icy exteriors, and present the best possible chances for extraterrestrial life. The search for life will involve drilling through ice, however, an incredibly complex task even here on Earth. Engineers will have to design a remotely operated drilling system that can withstand the stresses of launch, spaceflight, and landing; drill through massive layers of ice using only batteries or nuclear power; and capture, analyze, and return data to Earth—quite a list! The testing for such a drilling system will begin on our own planet’s subglacial lakes.

June 7, 2018

Last month, on May 5, the United States National Aeronautics and Space Administration (NASA) launched a new Mars probe called Insight from Vandenberg Air Force Base in California. InSight is short for Interior Exploration using Seismic Investigations, Geodesy, and Heat Transport. InSight, a probe that will study the formation of Mars, is NASA’s first interplanetary mission launched from the west coast of the United States. All previous such launches took place at Cape Canaveral Air Force Station in Florida.

This artist’s rendition shows the InSight lander operating on the surface of Mars. The probe is scheduled to land on Mars on Nov. 26, 2018. Credit: NASA/JPL-Caltech

The InSight mission cost just $814 million, a relatively small sum in the multibillion-dollar science of space exploration. The bargain probe will break new ground, however, quite literally, by drilling into the Martian surface. It will sample temperatures, measure the magnetic field, and record seismic levels, all to help scientists understand the planet’s formation. The data may also shed light on the formation of Earth and our solar system.

A NASA Atlas V rocket carrying InSight breaks through the clouds above Vandenberg Air Force Base in California on May 5, 2018. Credit: Cory Huston, NASA

Earth has three major layers: the crust, the mantle, and the core. Planetary scientists think our solar system’s other rocky planets—Mercury, Venus, and Mars—also have these layers. Scientists are unsure, however, how thick the layers are in the other planets. Earth has churned itself up through the process of plate tectonics, changing the chemical makeup and size of its layers over time. But Mars, the fourth planet from the sun, has experienced much less seismic activity. The planet’s present structure, then, should somewhat resemble its original composition when the solar system was formed.

Beginning in late November 2018, NASA’s InSight probe will study the formation of Mars, the fourth planet from the sun. Credit: NASA/JPL/Malin Space Science Systems

InSight carries three instruments vital to its mission. The Seismic Experiment Interior Structure (SEIS) sensor will study seismic waves from marsquakes (the Martian equivalent of earthquakes) to determine the structure of the interior of Mars. The Heat Flow and Physical Properties Package (HP³) will drill down almost 15 feet (5 meters) below the Martian surface—the deepest extraterrestrial excavation to date. As it drills, HP³ will record temperature changes to see how much heat remains from Mars’s formation billions of years ago. Scientists can determine the age of rocks, fossils, and other objects by measuring the radioactive elements in them, a science called radiogeology. A third InSight instrument will measure Mars’s magnetic field.

In an unusual arrangement, a robotic arm will move SEIS and HP³ from docks on the body of the lander to the surface of Mars. Tethers will control and power the instruments. Other than that, InSight’s design is pretty standard. Engineers reused much of the design of NASA’s Pheonix lander, which, in 2008, studied the history of water on Mars. By reusing this successful design, engineers saved many millions of dollars on the mission.

Two CubeSats (miniature satellites) hitched a ride on InSight’s rocket and are also traveling to Mars. The CubeSats are the first such satellites to venture beyond Earth’s orbit, and they will help transfer data from InSight during the probe’s landing.

InSight is scheduled to land on Mars on Nov. 26, 2018. Despite NASA’s strong recent record for Mars missions and the use of the proven Phoenix platform, success is far from guaranteed. Over the years, nearly two-thirds of all Mars missions have failed before completing their planned observations.

May 15, 2017

This week’s mythology star, Mars, the god of war, held a special place in the hearts of the ancient Romans—not because of the god’s warlike nature but because the Romans considered him the father of the legendary founders of Rome, Romulus and Remus.

Mars, the Roman god of war, was known as Ares in Greek mythology. Credit: © INTERFOTO/Alamy Images

The Romans did not always think of Mars as a war god. Originally, they worshiped him as the god of farmland and fertility. They named the first month of their crop-growing season after him. Known by the Romans as Martius (our March), that month was also the beginning of the Roman year.

After they came into contact with the Greeks, the Romans gave Mars the characteristics of the Greek god of war, Ares. Over time, Mars became associated principally with war and conquest. The Romans offered sacrifices to Mars before and after battles.

However, one of the most famous stories about Mars does not involve war at all—or at least not armies in conflict. The tale concerns the god’s affair with Venus, the goddess of love. Possessed of a dazzling beauty, Venus was married to Vulcan, who was considered the least attractive of the gods. Vulcan was the blacksmith to the gods as well as the god of fire, metalworking, and skilled craftwork in general.

According to one version of the story, the sun witnessed a secret romantic meeting of Mars and Venus. Shocked by the affair, the sun told Vulcan about it. Vulcan immediately prepared a trap for the lovers. He crafted a huge net made of a metal that was incredibly strong but so fine that it could not be seen. Vulcan took the net and arranged it around the bed in his and Venus’s bedchamber. Before long, Venus and Mars met for another romantic tryst. As they embraced, the net closed on them, and they were trapped—caught in the midst of their affair. Then Vulcan, hoping to shame the lovers, showed other gods into the bedroom to see the lovers snared in the net. However, the gods did not cry “shame” or berate the lovers as he hoped they would. Instead, the gods laughed and laughed at the sight, and delightedly told the story again and again. Through the years, besides being a popular tale among the Roman gods, the story of the love affair between Venus and Mars became a favorite subject for poets and painters here on Earth.

In some ways, Mars lives on. In addition to having the third month of our calendar named after him, his is the name given to the fourth planet of our solar system. The planet Mars can be seen with the unaided eye and was known to ancient observers. As they gazed upon the blood-red planet, the Romans associated it with war and conflict and so they named it after Mars, their god of war.

And by the way, the next time you hear a march or the martial music of a military band, maybe give a thought to Mars. After all, the words march and martial are both based on his name.

May 3, 2017

In Andy Weir’s 2011 book The Martian and its 2015 film adaptation,  botanist-astronaut Mark Watney manages to grow potatoes while marooned on Mars. Watney hauls Martian soil into a pressurized, climate-controlled base and harvests a crop that provides food while his other supplies run out. Today, a group of Peruvian scientists are working on transferring this fiction to reality. Agricultural researchers from the International Potato Center (called the Centro Internacional de la Papa in Spanish, or CIP) in Lima, the Peruvian capital, have grown some rather hardy potatoes in an even worse environment than Watney’s Martian garden. The scientists’ research, carried out in the Andes Mountains of South America (where potatoes originated), might make farming on Mars or other barren places possible.

Scientists at the International Potato Center in Lima, Peru, grew a “Unique” potato in simulated Martian conditions within the container at left, called the “CubeSat.” Credit: © International Potato Center

Human exploration of Mars is one of the primary long-term goals of such space agencies as the United States National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA). But before people get there, scientists must solve a host of problems. First among them will be how to feed astronauts during an extended stay in the harsh environment of the Red Planet.

Potatoes originated in the often harsh environment of the Andean Highlands of South America. Credit: © Roux Frederic, Shutterstock

The ability to grow food during a space journey or while on the Martian surface has a number of benefits. Space could be saved in the spacecraft, allowing for other needed supplies, and instead of freeze-dried or tubular “astronaut food,” space explorers could eat a variety of freshly grown produce. But growing food on Mars—an extremely cold, dry, and nearly airless planet—will not be easy. Life as we know it cannot survive on its surface—yet.

The ability to grow food on Mars will greatly help in the planet’s exploration and possible settlement. Credit: NASA/JPL/Malin Space Science Systems

In Peru, the CIP scientists wanted to see if certain hardy potatoes could be grown in conditions similar to those found on Mars. To do this, the scientists built a sealed growing chamber (a garden in a box they called a “CubeSat”) and layered it with nutrient-weak, sandy soil similar to that found on Mars. They installed low-powered lights on a longer-than-Earth day-night cycle, and created a low-temperature and low-atmospheric pressure environment. They then tried growing dozens of varieties of potatoes in the simulator, irrigating them with nutrient-rich water. Of all the tested varieties, one called “Unique” grew best under the extreme conditions.

The Unique potato is exceptionally hardy, but it could not possibly grow on the surface of Mars without human intervention. The scientists grew the potatoes at temperatures around freezing, but surface temperatures on Mars can dip below -150 °F (-100 °C) at night. They were able to achieve growth with somewhat reduced atmospheric pressure (like the thin air at the top of the Andes Mountains), but Mars’s atmospheric pressure is a mere 0.7 percent of the atmospheric pressure on Earth. And, as far as we know, there is no nutrient-rich water on Mars. Liquid water near the Martian surface is only present during the planet’s summer, and it is extremely salty.

Potatoes are one of the world’s most important crops. The ability to grow potatoes and other crops in harsh conditions could prove vastly important as climate change alters the global environment. Credit: © David R. Frazier

The CIS experiment provided scientists and engineers with useful information on the extreme limits of vegetable cultivation. With the use of extremely hardy plants like the Unique potato, astronaut greenhouses could be kept cooler than Earth spaces, saving valuable electricity for purposes other than heating. Because plants can survive on carbon dioxide concentrations, excess carbon dioxide exhaled by astronauts could help provide the space garden’s protected atmosphere. If Martian soil could be manipulated for vegetable growth, it would negate the need to send bundles of Earth soil to the Red Planet.

Beyond its applications to space travel or Martian living, the CIS potato research has a more practical use here on Earth. As the climate changes from global warming, environmental conditions will become harsher in many places around the world. By studying how crops survive in extreme conditions, agricultural scientists may be able to discover and breed crops more resistant to the worst effects of climate change.

December 20, 2016

Researchers led by Cassie Stuurman of the University of Texas, Austin, recently used the Mars Reconnaissance Orbiter (MRO) to discover a vast deposit of ice beneath the surface of Mars. They published their findings in late November in the journal Geophysical Research Letters. To future human explorers, the ice deposit could prove more valuable than gold.

Large deposits of ice have been discovered beneath the surface of Mars, the fourth planet from the sun. Credit: NASA/JPL/Malin Space Science Systems

The MRO, launched by the United States National Aeronautics and Space Administration (NASA) in 2005, carries the highest resolution camera ever sent to Mars. The camera is capable of resolving (distinguishing) objects on the planet’s surface less than 1 meter (3 feet) across. Its high-resolution images helped identify safe landing sites for subsequent Mars landers and discovered recurring slope lineae, patterns on Martian hills and valleys likely formed by the flow of liquid water just below ground. The MRO payload also includes a high-resolution spectrometer that has mapped the occurrence of minerals formed in association with water; an instrument that measures temperatures, pressures, and dust concentrations throughout the Martian atmosphere; and ground-penetrating radar that can detect layered rocks and ice beneath the surface.

Images such as this one, showing curved depressions in Mars’s Utopia Planitia region, prompted NASA to use ground-penetrating radar aboard the Mars Reconnaissance Orbiter to check for underground ice. Credit: NASA/JPL-Caltech/Univ. of Arizona

This radar detected ice in a region called Utopia Planitia (planitia is a Latin word that can mean low plain or basin). It is the largest confirmed impact basin in the solar system, with a diameter of 2,100 miles (3,300 kilometers). An impact basin is a vast hollow created by a large asteroid or comet strike. The angular cracks and rimless pits in the Martian impact basin resemble similar surface features in Canada that mark underground ice deposits. The researchers estimate that the Martian ice deposit holds more water than North America’s Lake Superior, the largest body of fresh water on Earth. The deposit is buried beneath as little as 3 feet (1 meter) and as much as 33 feet (10 meters) of Martian soil. The deposit is not solid ice, but rather is 50 to 85 percent ice, with rock, dust, and other materials mixed in.

Billions of years ago, Mars was warmer than it is today. Oceans and streams of liquid water probably covered its surface. But the solar wind (continuous flow of particles from the sun) stripped away most of Mars’s atmosphere, causing much of the water to escape into space. Today, the surface of Mars is cold, dry, and dusty. Some water remains on Mars, however, frozen in underground deposits at the poles and other places around the planet.

The newly discovered ice deposit may have important implications for the eventual human exploration and colonization of Mars. Other such deposits exist on the planet, but most are small and found in areas with rough terrain. Mars’s poles are covered with large ice caps, but they are the coldest regions of the planet. Utopia Planitia is a large, flat basin located in the somewhat warmer mid-latitudes. Therefore, future Mars colonists may be able to land a spacecraft in Utopia Planitia and find water not far from their landing site. Such water could be used for drinking, growing crops, and creating rocket fuel for journeys back to Earth. Studying the ice could also help explain the history of Mars’s climate.

November 3, 2016

Last month, on October 19, Mars claimed another victim. A landing module named Schiaparelli, designed by the European Space Agency (ESA) and Russia’s space agency, Roscosmos, accidentally smashed into the Martian surface at more than 180 miles (300 kilometers) per hour. Schiaparelli (named for the Italian astronomer Giovanni Schiaparelli, who studied Mars in the late 1800′s) was destroyed, but the mission was not a total failure. The Mars Trace Gas Orbiter (TGO), launched with Schiaparelli, successfully entered into orbit around the Red Planet.

This artist’s impression shows the Trace Gas Orbiter and Schiaparelli (the small circular knob facing toward Mars) during the seven-month ExoMars voyage to the Red Planet. Credit: ESA/David Ducros

Despite is relatively inviting appearance, Mars is extremely difficult to explore. Of all the missions sent there, nearly two-thirds have failed before completing their planned experiments and observations. Landing on Mars is particularly difficult. The planet’s atmosphere is extremely thin, which means that parachutes and similar braking devices don’t work as well as they do in the much denser atmosphere of Earth. Mars is also a relatively large planet, and its significant gravitational pull forces a lander to carry large amounts of fuel for its rockets to slow the descent. On the surface, craggy rocks, enormous sandstorms, and frigid temperatures conspire to damage a lander as it settles into a safe resting place.

The ESA and Roscosmos launched ExoMars 2016, which consisted of Schiaparelli and the TGO, in March of this year. The lander was equipped with a parachute and rockets to slow its entry through the Martian atmosphere. The parachute deployed, but it ejected far too soon. To make matters worse, the rockets, which were supposed to fire for about 30 seconds, fired for only a few seconds before shutting off. Project engineers think these malfunctions stemmed from a software glitch that led the lander to act as though it was already on the Martian surface. Instead, it was actually plummeting through the Martian atmosphere. With nothing to slow it, Schiaparelli crashed into the Red Planet’s surface and exploded.

ExoMars 2016 did not function as the European scientists had hoped, but it could still be a successful mission. Schiaparelli was not intended to add much to the science output of the mission. It had enough power to survive only a few Martian days. Its primary objective was to demonstrate landing technology for the ambitious ExoMars 2020, which will attempt to land a rover on Mars. Mission leaders can take heart in the fact that the lander seems to have been doomed by a software failure, a problem much easier to fix than a hardware failure. But it will be small consolation to an ExoMars program that is already behind schedule and over budget.

The Trace Gas Orbiter, however–a crucial part of the future ExoMars mission–entered into orbit around Mars and appears to be functioning normally. The TGO will examine methane and other gases in the Martian atmosphere. It will help determine if this methane is the result of geological or biological processes. Scientists have not found direct evidence of life on Mars, but some think tiny organisms could exist below its surface. The TGO will also serve as a data relay center for the ExoMars 2020 rover, receiving commands from Earth for the rover and data from the rover to be sent back to Earth. Let’s just hope ESA and Roscosmos can stick the landing on the next try!