NASA safely landed a new robotic rover on Mars on Thursday, beginning its most ambitious effort in decades to directly study whether there was ever life on the now barren red planet.
While the agency has completed other missions to Mars, the $2.7 billion robotic explorer, named Perseverance, carries scientific tools that will bring advanced capabilities to the search for life beyond Earth. The rover, about the size of a car, can use its sophisticated cameras, lasers that can analyze the chemical makeup of Martian rocks and ground-penetrating radar to identify the chemical signatures of fossilized microbial life that may have thrived on Mars when it was a planet full of flowing water.
Now the fun really starts, Lori Glaze, director of NASAs planetary science division, said during a news conference after the landing.
NASAs earlier missions showed that in the distant past some places were warm, wet and habitable. Now it is time to learn whether there were ever any microscopic inhabitants there.
Its an enormous undertaking thats in front of us, and it has enormous scientific potential to really be transformative, Kenneth Williford, a deputy project scientist on the mission said during a news conference on Wednesday. The question is, Was Mars ever a living planet?
Mars has been the focus of more and more interest from explorers on Earth. The United Arab Emirates and China both began orbiting the planet last month, joining an armada of European and American spacecraft already studying it from space. And private entrepreneurs are looking toward the neighboring world, with some such as Elon Musk imagining that one day perhaps humans could live there.
The rover will set in motion a NASA plan that is to be carried out over the next decade, and it could bring samples from Mars back to Earth, where scientists will have even more capabilities to find something signaling that our planet is not the only place where life has ever been found.
The mission will also try to make a small experimental helicopter, Ingenuity, take flight in the thin Martian atmosphere something never accomplished before. Successful tests of this Marscopter could point the way toward new methods for searching the surface of Mars and other worlds from their skies.
A successful test of the helicopter would be a true extraterrestrial Wright Brothers moment, said Thomas Zurbuchen, NASAs associate administrator for science.
NASA has landed a series of rovers on Mars since the 1990s. Each has revolutionized human understanding of Mars.
The Spirit and Opportunity rovers, which landed in 2004, followed unmistakable signs of water that flowed several billion years ago. The Curiosity rover, which arrived in 2012, quickly discovered that its location, the 96-mile-wide Gale Crater, was once a freshwater lake, an environment that was clearly habitable even though it was not equipped to answer whether microbes once inhabited the lake.
Perseverance, by contrast, has the tools that can search for complex carbon-based molecules that could be the remnants of past microbes.
Were looking for lifelike shapes, and lifelike compositions, Dr. Williford said. Chemical compositions so the elements, the minerals, the molecules, the organic molecules that we know are associated with life were looking for all those things occurring together.
The setting for the missions studies is Jezero, a 30-mile-wide crater that was once a large lake filled by a river delta. The rover will crawl along the ancient delta, poring over its piles of sediments in search of those chemical signals of microbes that were extinguished as Mars turned cold and barren.
But Perseverance will most likely be unable to provide definitive proof of past life. Another part of its mission is to be the first step in a complicated robotic game of pick up sticks that will eventually bring some of the rocks back to Earth for scientists to study up close.
Perseverance will drill rock samples, seal them in tubes and then drop them onto the surface. A later rover, from the European Space Agency, will retrace Perseverances path in order to pick up the tubes and transfer them to a small rocket that will blast off to space. The samples will then be transferred to another spacecraft in orbit around Mars for the trip back to Earth, sometime in the early 2030s.
Perseverance was the third robotic visitor from Earth to arrive at the red planet this month. Last week, two other spacecraft, Hope from the United Arab Emirates and Tianwen-1 from China, entered orbit around Mars.
But NASAs spacecraft did not go into orbit first. Instead it zipped along a direct path to the surface.
At 3:48 p.m. Eastern time, controllers at the mission operations center at NASAs Jet Propulsion Laboratory near Pasadena, Calif., received word from Perseverance that it had entered the top of the Martian atmosphere at a speed of more than 12,000 miles per hour. The spacecraft was beginning the landing maneuvers that would bring it to a soft stop in just seven anxiety-drenched minutes.
All that anyone on Earth could do was watch and hope that Perseverance performed as designed.
Mars is currently 126 million miles from Earth. Radio signals, traveling at the speed of light, take more than 11 minutes to travel from there to here. That means that when the message announcing the start of the landing sequence reached Earth, the rover had already been on Mars for four minutes. The only uncertainty was whether it had safely arrived in one piece, or had crashed into many pieces, another human-made crater on the surface of Mars.
The atmosphere of NASAs operations center more sparsely filled than previous Mars landings because of precautions required by the coronavirus pandemic was mostly pensively quiet.
At 3:55 p.m. cheers erupted in the control room when Perseverance arrived on the surface.
As designed, the landing system set the rover down on a flat spot a bit more than a mile to the southeast of the river delta the scientists want to explore, near the boundary between two types of rocks, an area that could tell scientists a lot about the geologic history of the area.
This is a great place to be, said Kenneth Farley, the project scientist, said in the news conference after the landing.
Much of the surrounding terrain was more rugged. We found the parking lot and hit it, said Allen Chen, the lead of the engineering team that designed Perseverances landing.
Matt Wallace, deputy project manager on the rover, described the nagging worries of trying to execute the landing.
It consumes you, he said. It becomes part of you. And in some ways, its hard still to believe that we finished it and that were done.
The pandemic had made the task even more complicated as the rovers teams on Earth rushed last year to meet an unmovable launch date in July last when Earth and Mars were close enough. If they had missed that, the rover would have had to stay on Earth for another two years.
The pandemic struck and just about the worst time for this mission, Mr. Wallace said.
Various speakers during the news conference described the difficulties of adapting to the new working conditions, but the team made adjustments, and the mission stayed on schedule.
Plaudits rolled in.
About an hour after landing, I got a phone call from the president of the United States, Steve Jurczyk, the acting administrator of NASA, said. And his first words were, Congratulations, man.
The first few weeks will be spent testing out the equipment, turning on the instruments, making the first few short drives. Then NASA will turn its focus to testing its experimental helicopter.
Over the coming weeks, Perseverance will deploy the four-pound flying machine. If the Ingenuity helicopter works, it will be the first such flight in the atmosphere of another world in the solar system.
Flying on Mars is not a trivial endeavor. There is not much air there to push against to generate lift. At the surface of Mars, the atmosphere is just 1/100th as dense as Earths. The lesser gravity one-third of Earths helps with getting airborne. But taking off from the surface of Mars is like flying through air as thin as that found at an altitude of 100,000 feet on Earth.
Ingenuity is the flying equivalent of Sojourner, NASAs first Martian rover, which landed on the red planet in 1997. Although it was the size of a microwave oven and just a demonstration of the basic technology, scientists could already see the benefits of driving to explore a variety of rocks and surface features, instead of sitting in one place like the earlier Viking landers.
With NASAs rover on the surface, space watchers will soon turn their eyes back toward Chinas Tianwen-1 mission. As it orbits Mars, the spacecraft is preparing for a rover landing of its own. In May or June, the missions lander and unnamed rover will try to set down in a basin called Utopia Planitia. If it succeeds, that explorer will study the ice composition of the region, potentially helping future astronauts understand what resources are available to them should they set off for the red planet.
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NASAs Perseverance Rover Lands on Mars to Renew Search for Extinct Life - The New York Times
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