The Parker Solar Probe approaches the sun in this artist’s depiction. The probe’s path takes it nearer to the sun than any other human-made object, allowing it to make close-up observations of solar activity.
NASA

The Parker Solar Probe has done the unthinkable. It became the first spacecraft to touch the sun! Scientists reported the announcement on Dec. 14, 2021, at the press conference at the 2021 American Geophysical Union Fall Meeting in New Orleans, Louisiana. The probe was built and operated by the Johns Hopkins Applied Physics Laboratory. The probe flew through the upper atmosphere of the sun, called the corona, to collect samples. The samples will allow scientists to understand more about the sun, just like landing on the moon paved the way for scientists to learn about the moon.

The National Aeronautics and Space Administration (NASA) launched the Parker Solar Probe in 2018. The probe completed its first orbit of the sun in 2019. The probe is the fastest human-made object in the solar system. The sun’s gravity is expected to accelerate the probe to extreme speeds of up to 430,000 miles (700,000 kilometers) per hour. Three years after the launch, the probe has arrived at the sun.

The goals of the mission are 1) to study how energy and heat flow through the corona; 2) to gather information on plasma (the gaslike substance the sun is composed of) and magnetic fields near the sun; and 3) to learn more about how high-energy particles travel outward from the sun.

It uses a set of instruments known as FIELDS, which has antennas to measure electric fields and magnetometers to measure magnetic fields. The probe is also equipped with a pair of cameras to capture images of the sun. The probe carries various instruments for studying particles in the solar wind—that is, the continuous flow of particles from the sun.

The sun’s corona can be as hot as 4,000,000 °F (2,200,000 °C). Because of the corona’s low density (concentration of matter), the Parker Solar Probe will not experience the sun’s most intense heat. However, it will encounter temperatures of up to 2,500 °F (1,377 °C)—hotter than lava from a volcano.

The Parker probe is planned to approach the sun 24 times by the mission’s end. Hopefully, the Parker probe can stand the heat and gather more information about the corona and solar winds.

Browns’ 1969 patent plan for an elaborate home security system suggests safety and relaxation can go hand in hand.
Credit: U.S. Patent and Trademark Office

Today many people have security systems installed in their houses. Security systems set off an alarm when someone breaks in and automatically call the police. Home security systems also connect to smoke alarms and call the fire department if there is a fire. Some people also have security cameras around the house. They can show us when we have a package at the front door or when a visitor is waiting outside. Newer models even let you open the door from your smartphone or smartwatch! Do you know about the woman who invented the first home security system?

Well, she did not work for the CIA, FBI, or Homeland Security. Marie Van Brittan Brown was a Black American nurse. She was born on Oct. 22, 1922, in the Queens borough (section) of New York City. She married Albert Brown, an electronics technician. She worked late hours as a nurse and was concerned about the slow response time of the police in her neighborhood. Brown created a home security system for their house and filed for a patent in 1966. Brown called her invention the “Home Security System Utilizing Television Surveillance.”

The system involved a camera that monitored four different areas, displaying surveillance footage on a television. The system also had a two-way microphone, a button to let visitors into the house, and a button that called the police. The patent was approved in 1969. However, Brown never found a manufacturer or marketed her invention. Brown died on Feb. 2, 1999, in Queens.

An image of Venus, made with data recorded by Japan’s Akatsuki spacecraft in 2016, shows swirling clouds in the planet’s atmosphere.
Credit: PLANET-C Project Team/JAXA

Venus is heating up—figuratively, that is. It has always been the hottest planet in the solar system, with surface temperatures of about 870 °F (465 °C). But new findings from the mysterious planet have been pouring in. Soon, a new generation of space probes will transform Venus from a sleepy solar system backwater to a bustling hub of scientific discovery.

Venus is the second planet from the sun. It is known as Earth’s “twin” because the two planets are so similar in size. The diameter of Venus is about 7,520 miles (12,100 kilometers). This diameter is about 400 miles (640 kilometers) smaller than that of Earth. No other planet comes nearer to Earth than does Venus. At its closest approach, it is about 23.7 million miles (38.2 million kilometers) away.

But Venus is better described as Earth’s evil twin, in respect to its withering conditions. In addition to the high temperatures, the atmospheric pressure is 90 times greater than that on Earth. Carbon dioxide makes up most of the atmosphere. The skies are strewn with clouds of sulfuric acid.

Scientists sent several probes to learn more about the planet in the 1960’s and 1970’s. But as space agencies learned of its inhospitable conditions, they concentrated their efforts elsewhere, particularly Mars. The last United States National Aeronautics and Space Administration (NASA) mission to study Venus, called Magellan, launched in 1990. Thus, scientists know relatively little about Venus, despite its close proximity to Earth and its similar size.

Despite the dearth of missions in recent years, planetary scientists continue to scan the planet with Earth-based instruments and reanalyze older data. They have returned surprising results.

Last year, a team of scientists announced that they had discovered a gas called phosphine in Venus’s atmosphere. Many living things on Earth produce phosphine; and scientists have not been able to identify any non-biological processes on Venus that might produce it. This raised the possibility that microbial life could exist in Venus’s atmosphere, where the conditions are much milder. But the discovery has been controversial. Other teams have failed to find any phosphine signature.

Last month, a team led by researchers at Queen’s University Belfast left the floating-Venusian-microbes idea high and dry. They found that Venus’s atmosphere does not contain enough water vapor to support life, irrespective of the presence of phosphine. The team determined that even the most extreme microbes on Earth require an environment with dozens of times more water than is available in Venus’s atmosphere.

Another recent study has shed light onto possible changing of Venus’s surface. Previously, Earth was the only rocky planet known to have a moving surface. A team lead by Paul Byrne, a professor at North Carolina State University, found evidence that parts of Venus’s surface might be slowly moving today. Earth’s crust slowly reshapes itself by a process called plate tectonics. Large pieces of the surface, called plates, subduct (sink) under one another, forming mountain ranges and other features. New crust forms along the ridges where the plates pull away from each other. In contrast, Byrne’s team found that pieces of Venus’s crust move like pack ice in polar oceans. Learning more about crust movement on Venus will help scientists understand how such processes develop on other planets, including Earth and exoplanets that might harbor life.

Last month, space agencies announced that not one, but three missions will be exploring Venus in the next 15 years. On June 2, NASA announced it is sending two mission to Venus. The missions were selected as part of part of NASA’s lower-cost Discovery Program. NASA expects to launch both missions between 2028 and 2030.

VERITAS (Venus Emissivity, Radio Science, InSAR, Topography, and Spectroscopy) will orbit the planet and map its surface with greater detail than ever before. It will allow scientists to better understand the planet’s features.

DAVINCI+ (Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging) consists of a sphere that will plunge through Venus’s thick atmosphere, studying the atmosphere’s composition. The DAVINCI+ mission planners are seeking evidence of an ocean of water that might have covered Venus’s surface eons ago.

There are other players in the new Venus boom. Last year, American company Rocket Lab announced plans to launch a small probe to Venus as early as 2023. And on June 10, just over a week after NASA’s selection DAVINCI+ and VERITAS, the European Space Agency (ESA) announced that it would also be sending a probe Venus. The EnVision orbiter will search for signs of current and former tectonic activity and the presence of a past ocean. EnVision is scheduled to arrive at Venus in 2034 or 2035.

The desire to learn more about Venus is fed by more than just curiosity about our nearest neighbor. Astronomers are looking for signs of life on exoplanets. But Venus and Earth would look quite similar from light-years away. Learning more about Venus and how it evolved to become so different from Earth will help astronomers better weed out Venus-like exoplanets in their search for ones that are more like Earth.

British businessman Richard Branson poses in front of the spaceplane VSS Unity with the other missions specialists of Virgin Galactic’s Unity-22 mission. The glass-paneled terminal of Spaceport America is visible in the background. From left to right: Beth Moses, Chief Astronaut Instructor; Branson; Sirisha Bandla, Vice President of Government Affairs and Research Operations; Colin Bennett, Lead Operations Engineer.
Credit: © Virgin Galactic

After years of delay, the age of space tourism may finally be upon us. On Sunday morning, the British businessman Richard Branson flew aboard his company Virgin Galactic’s spaceplane in a suborbital flight. Soon, paying customers will get their turn to go to space.

Branson rode with five other members of his company on VSS Unity.VSS Unity is a SpaceShipTwo model spaceplane. A special aircraft called a WhiteKnightTwo takes off from a runway carrying a SpaceShipTwo. A WhiteKnightTwo named VMS Eve took off from Spaceport America in New Mexico and carried VSS Unity up above 45,0000 feet (14,000 meters). After Eve released Unity, pilots ignited a rocket engine and the craft soared up to 300,000 feet (90,000 meters). After a few minutes of weightless freefall, Unity glided back down to Earth. The whole flight lasted about 90 minutes.

Branson and the other mission specialists float around the cabin of VSS Unity during the spaceplane’s July 10 flight.
Credit: © Virgin Galactic

Branson has always relished spectacle, and Sunday’s flight was no different. Virgin Galactic’s live stream of the event was hosted by the American comedian Stephen Colbert. The landing featured the debut performance of “New Normal”, a new song by American singer Khalid. South-African-born entrepreneur and fellow space baron Elon Musk (founder of SpaceX) was among the well-wishers at Spaceport America.

Branson’s flight is a hopeful milestone on Virgin Galactic’s long, fraught road toward commercial operations. Branson founded the company in 2004. He licensed the technology of the American aerospace company Scaled Composites, which won the Ansari X Prize that year for developing a rapidly reusable launch vehicle. Virgin Galactic unveiled SpaceShipTwo in 2006. But the next year, an explosion during a ground test killed three Scaled Composites employees and injured three others. In 2014, a SpaceShipTwo named VSS Enterprise broke apart during a test flight. The pilot was killed and the copilot seriously injured. Despite these setbacks, Virgin Galactic forged ahead. Unity was completed in 2016 and underwent several test flights prior to its mission Sunday.

Space tourism existed long before Unity’s flight on Sunday. In 2001, the American investment consultant Dennis Tito became the first space tourist, visiting the International Space Station (ISS) aboard a Russian Soyuz craft. Over the next several years, a handful of space tourists made similar trips. But they all paid tens of millions of dollars to buy extra seats aboard government-funded spacecraft.

Until about a week ago, it appeared that American businessman Jeff Bezos, not Branson, was going to be the first mogul to fly to space aboard his own spacecraft. Bezos, who made billions from his online shopping company Amazon, founded an aerospace company called Blue Origin in 2000. Bezos is scheduled to launch aboard his company’s reusable New Glenn rocket on July 20. Although Branson denied the existence of a race between the two, he added himself to Sunday’s flight, which was originally scheduled as a test flight, after Blue Origin’s announcement.

Virgin Galactic plans to hold two more test flights before starting paying trips, probably sometime in 2022. Then, it will begin scheduling rides for the 600 people who purchased tickets.

Space tourism will still be for the very wealthy. Virgin Galactic was selling tickets for $250,000 apiece before it paused ticket sales after the 2014 accident. Blue Origin has not yet begun selling tickets, but they are expected to be within the same range. So, if you’d like to go to space, save your pennies!

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.

Indian-born American astronaut Kalpana Chawla
Credit: NASA

May is Asian American and Pacific Islander (AAPI) Heritage Month. All month long, Behind the Headlines will feature AAPI pioneers in a variety of areas.

In 1997, the American astronaut Kalpana Chawla (1962-2003) became the first Indian-born woman to travel into space. Chawla served on two missions aboard the United States space shuttle Columbia as a mission specialist and robotic arm operator.

Chawla was born on March 17, 1962, in Karnal, northern India. Karnal was part of the state of Punjab at that time. Today, it is part of the state of Haryana. She graduated from the Punjab Engineering College in 1982. That same year, she immigrated to the United States. In 1984, she earned a master’s degree from the University of Texas in Austin. She married Jean-Pierre Harrison, an aviation teacher and author, in 1983. She received her doctorate in aerospace engineering from the University of Colorado at Boulder in 1988. She then went to work at the National Aeronautics and Space Administration (NASA). In 1994, she was selected for training as an astronaut candidate.

In 1997, Chawla flew her first mission on the shuttle Columbia. She was the second person of Indian descent to travel in space, following the Indian-born cosmonaut Rakesh Sharma, who traveled on a Soviet Soyuz spacecraft in 1984. Chawla’s duties involved conducting experiments in microgravity, sometimes called zero gravity or weightlessness, and launching a satellite using the shuttle’s robotic arm. Her second mission was on the same shuttle in 2003. However, on Feb. 1, 2003, as the Columbia was returning to Earth after the 16-day mission, the spacecraft broke apart high over Texas. Chawla and six other crew members were killed.

Chawla received many honors for her work in space. They include the Congressional Space Medal of Honor, the NASA Space Flight Medal, and the NASA Distinguished Service Medal. In addition, an asteroid that orbits the sun between Mars and Jupiter is named the 51826 Kalpanachawla in her honor.

Credit: WORLD BOOK photo

April 23 is World Book Day, a celebration of the special role that books play in our lives. To celebrate, we at World Book (get it?) invited author William D. Adams to talk about his experience creating a special set of books, Out of This World 2.

I’m Will Adams, a content creator at World Book. I’ve had the privilege of working on many books during my career at World Book, most recently by writing the second series of Out of This World.

When I was a kid, I loved going to the local library and browsing the science and science fiction sections. But as I got older, I got frustrated by the technological leaps required in science fiction. Why couldn’t we live in space and travel among the stars already?

Out of This World is World Book’s collaboration with a branch of the United States National Aeronautics and Space Administration (NASA) called the NASA Innovative and Advanced Concepts program (NIAC). NASA is world-famous, but you may never have heard of NIAC before. NIAC is working to bring some of that technology from science fiction into existence.

NIAC is a bit like a startup incubator for space exploration projects. Scientists, engineers, entrepreneurs, or anyone else from across the United States may submit a proposal to NIAC about an idea that could revolutionize the way we reach, explore, or live in space. The idea has to be revolutionary and largely unstudied: no small plans are allowed. A committee reviews the proposals and awards small grants to the most deserving projects.

The NIAC inventors use the money to test their ideas and to work out details of their designs. The hope is that the best ideas become part of NASA missions or get picked up by the private space industry.

One of the most prominent ideas to “graduate” NIAC is the starshade. A starshade is a spacecraft with a giant, unfolding shade, a bit like a giant umbrella. The shade can block out a distant star’s light, enabling a space telescope to directly image any exoplanets (distant planets) orbiting around it. It’s the same principle as using your hand to block the sun’s light when trying to see something in the bright sky. Engineers hope to launch a starshade in the next 5 to 10 years.

I had so much fun interviewing the scientists and engineers for this series. They’re all incredibly smart people, of course, but also down to earth and from a wide variety of backgrounds. And—no surprise here—many of them were inspired by books growing up, both fiction and nonfiction.

Out of This World reads like a blueprint for the future. It shows how we can study other planets, how we can get to those planets faster, how we can live in space or on other planets, and even what to wear when we get there!

Amazingly, Out of This World 1 & 2 only scratch the surface of the innovative concepts that NIAC has funded. And, NIAC’s blueprint for the future grows every year. Just a couple of weeks ago, on April 8, they released their 2021 Phase II and III grants. These awards are for projects that are proven to work but need more research and development before they can be incorporated into mission designs.

One 2021 Phase II grant is to further study plans for a huge radio telescope. Remember the Arecibo telescope that collapsed last year? Think of this as an extra-large replacement—but located on the far side of the moon! NASA engineer Saptarshi Bandyopadhyay proposes sending a robotic probe to construct a giant radio dish in a lunar crater. Shielded from the noisy radio-wave emissions of human technology on Earth, such a telescope could study the early history of the universe. I can’t wait to write about it in series 3!

I hope you celebrate World Book Day by picking up a book and getting inspired, just as many of the NIAC inventors did. Maybe you’ll be inspired to think about things a different way, to write your own story, or even to explore the stars.

Nyan Cat
Credit: © Chris Torres

How much would you pay for an image of an animated cat with a Pop-Tartlike body soaring through a starry sky, trailing a rainbow in its wake?

If you said about $600,000, then you might be the proud owner of a non-fungible token, or NFT, of this feline-pastry-color explosion (also known as Nyan Cat).

An NFT is a unique digital file of such things as a piece of digital art, video clip, or digital coupon. A person can buy an NFT, becoming the sole owner of that digital file. Think of it as a digital certificate of authenticity.

The key word is digital. This means that the person who purchased the NFT of Nyan Cat can’t display the framed picture in a museum or even touch the picture to see if the Pop-Tartlike body is as flaky as the original treat. Rather, an NFT represents ownership of something you cannot hold in your hand.

NFT’s have been attracting a lot of attention because they have been fetching extremely high prices. A video clip of the basketball superstar LeBron James blocking a shot sold for $100,000 in January. Two months later, the artist known as Beeple sold his digital collage Everydays: the First 5000 Days for $69 million.

Everydays: the First 5000 Days is a JPEG created by Mike Winkelmann, known professionally as Beeple. The work is a collage of 5000 images created by Winkelmann for his “Everydays” series. A non-fungible token representing Everydays: the First 5000 Days was sold for $69.3 million at Christie’s in 2021, the highest price paid for an NFT and the third-most expensive work by a living artist.
Credit: Everydays: the First 5000 Days (2021), JPEG created by Beeple (Mike Winkelmann); Christie’s

Just as you can’t pick up and hold an NFT in your hand, you can’t pick up an NFT at your local supermarket. There are several online NFT marketplaces, including OpenSea, Rarible, and Mintable. There is a marketplace for basketball moments called NBA Top Shot. And, if you’re in the market for a social media post, Valuables sells tweets.

So, what’s so valuable about an NFT?  The owner of Beeple’s work can’t feature the image in a dining room or use the 5,000-image collage to wallpaper a house—perhaps winning the award for most expensive wallpaper of all time. People buy NFT’s, particularly NFT art, in the hopes that the value will soar. The owner of Everydays: the First 5000 Days might think that the collage could re-sell for $100 million or more. In that way, purchasing an NFT could be a good investment opportunity.

Other people buy NFT’s for publicity or to join the ever-growing community of NFT enthusiasts. Some people might just want bragging rights. And bragging rights—whether digital or tangible, Pop-Tartlike or Toaster-Strudelike—are always valuable.

Hyrule Warriors: Age of Calamity (2020)
Credit: © Nintendo

The year 2021 marks the 35th anniversary of one of the most beloved video game series of all time. “The Legend of Zelda” is a fantasy adventure series developed by Nintendo for play on the company’s video game consoles and handheld game systems. A video game console is a specialized gaming computer that connects to a television.

In the main series of Zelda games, the player controls an elflike boy named Link on a solitary quest. Zelda is the name of a princess whom Link must often rescue. Armed with a sword, shield, and other magical items, Link must explore puzzle-filled dungeons and battle fantastical monsters. Critics have widely praised the Zelda games for their rich, interactive worlds, engaging puzzles, and dramatic musical scores.

The Japanese game designer Shigeru Miyamoto created the first Zelda game, The Legend of Zelda, released in 1986. The game’s spirit of adventure and mystery was inspired by Miyamoto’s recollections of his childhood explorations of a cave by lanternlight. He took the name Zelda from Zelda Fitzgerald, the wife of the American novelist F. Scott Fitzgerald. The Legend of Zelda became the first video game to enable players to save their progress across multiple play sessions.

The Legend of Zelda (1986)
Credit: © Nintendo

Sequels to the game featured increasingly complex gameplay. The Legend of Zelda: A Link to the Past (1991), for example, challenged players to explore a parallel “dark world” that mirrored the game’s main world. In The Legend of Zelda: The Ocarina of Time (1998), players use a magic ocarina (flutelike instrument) to change the passage of time. Early Zelda games, like most early electronic games, featured two-dimensional gameplay. The Ocarina of Time is considered a pioneering work of three-dimensional play.

Since 2000, Eiji Aonuma, another Japanese designer, has led development on most Zelda games, with Miyamoto playing a more advisory role. Aonuma’s games include The Legend of Zelda: The Wind Waker (2002), in which players control the wind to sail across a vast ocean. The Legend of Zelda: Twilight Princess (2006) was noted in part for its darker, spookier tone. Aonuma also produced The Legend of Zelda: Skyward Sword (2011). The game introduced virtual sword fights that closely track the player’s swings and thrusts with the game controller.

The Zelda series returned to its open-world roots with The Legend of Zelda: Breath of the Wild (2017). The game presented players with a sprawling three-dimensional world to explore: killing monsters, foraging for natural materials, and completing quests in the desired order. This setting was also featured in Hyrule Warriors: Age of Calamity (2020), an action game that served as one of many spinoffs of the Zelda series.

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.