NASA's next Mars rover will feature lasers, ground-penetrating radar and other high-tech science gear designed to help it snag samples of the most interesting Martian rocks for eventual return to Earth.
The U.S. space agency announced today (July 31) that the new car-size rover will carry seven instruments when it launches toward the Red Planet in 2020. The different parts of the science payload are designed to work together to identify rocks that have the best chance of preserving evidence of past life on Mars, if it ever existed, officials said.
The Mars 2020 mission instruments "overlap, and they complement each other," Michael Meyer, lead scientist for the Mars Exploration Program at NASA headquarters in Washington, D.C., told reporters in a televised press conference announcing the instruments. "All of this leads to picking out those rocks that we want to core and cache and potentially bring back to Earth." [NASA's 2020 Mars Rover in Pictures]
Examining Red Planet material in well-equipped labs here on Earth is the best way to search for signs of Mars life, scientists say.
The science gear
The 2020 rover will follow in the wheel tracks of NASA's Curiosity rover, which touched down in August 2012 to determine if Mars could ever have supported microbial life. Curiosity has already achieved that goal, finding that an area near its landing site was indeed habitable billions of years ago.
But NASA wants the next rover to go a step further. Last year, the mission's "science definition team" recommended that the 2020 rover search for biosignatures, cache samples for potential return to Earth and advance the space agency's goal of putting astronauts on Mars.
"It was kind of a tall order," Meyer said. But, he added, "we've been able to put together a great payload that actually meets or exceeds all the measurement requirements that this science definition team laid out 13 months ago."
Like Curiosity, the 2020 Mars rover will have six wheels, weigh about 1 ton and land with the aid of a rocket-powered sky crane, NASA officials said. But while Curiosity totes 10 science instruments, its cousin will sport just seven.
Two of those instruments will sit on the 2020 rover's head-like mast. MastCam Z is a stereoscopic camera system that will also have the ability to zoom in on interesting targets, officials said. And the laser-shooting SuperCam is an advanced version of Curiosity's ChemCam instrument, which allows the rover to determine the chemical composition of rocks from afar. [NASA's 2020 Mars Rover Science Plan (Video)]
The rover will also carry two science instruments on its robotic arm — PIXL (Planetary Instrument for X-ray Lithochemistry) and SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics and Chemicals).
PIXL, an X-ray flourescence spectrometer that also features a high-resolution imager, will allow mission scientists to perform fine-scale investigations of Martian rocks, officials said. SHERLOC is a spectrometer that will enable detailed study of rocks and, like SuperCam, also potentially detect organics.
The 2020 Mars rover's body will house the other three instruments, which include a high-tech weather station called MEDA (Mars Environmental Dynamics Analyzer), a ground-penetrating radar system called RIMFAX (Radar Imager for Mars' Subsurface Exploration) and MOXIE, which is short for Mars Oxygen ISRU Experiment.
MOXIE is designed to produce oxygen from Martian air, which is rich in carbon dioxide, demonstrating technology that could be useful for human explorers on the Red Planet.
"If you can actually cache and put oxygen in storage tanks before the crew even arrives and you know they have a habitable environment and place to go when they get there, that's tremendously important to us," said Bill Gersteinmaier, associate administrator for the Human Exploration and Operations Mission Directorate at NASA headquarters.
MOXIE "will buy down the uncertainty of that," he added. "It'll make sure that we understand the risks associated with that, and we can do the appropriate planning as we move forward for human missions."
The seven instruments — which were chosen from a pool of 58 proposals — will cost NASA about $130 million, Grunsfeld said. The agency expects the entire 2020 Mars rover mission to cost about $1.9 billion, he added. (Curiosity's mission has a price tag of about $2.5 billion.)
Looking ahead to sample-return
The 2020 Mars rover will also feature a coring drill, which will collect samples of rocks flagged as promising by the robot's instrument suite. It's unclear at the moment where these samples will be stored; they may be carried on the rover or placed on the ground somewhere, officials said.
The goal is to eventually get those rocks back to Earth, where scientists all over the world can pore over them to search for signs of Mars life. This job is too difficult — and too important — to entrust to a robot all by itself on the surface of another world, NASA officials said.
"As Carl Sagan said, extraordinary claims require extraordinary evidence," said John Grunsfeld, associate administrator of NASA's Science Mission Directorate.
"It's really going to be when we have the best analytical instruments, and our ability to interrogate these samples at the smallest scales with the best instruments, that we may really then be able to say for sure whether or not Mars once had life."
There's no concrete plan at the moment for bringing the samples back; no such return mission is on NASA's books. But properly sealed samples could be stored for 20 years or so on the Martian surface, Meyer said, so there's still time to figure out how to get them to Earth.
"I wouldn't rule out the possibilty that it's future astronauts that pick up the sample and bring it back to Earth," Grunsfeld said. "But that's forward work. We haven't defined that."
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