This artist's concept shows a sample of Martian rocks and soil blasting off the Red Planet's surface, destined for scientists' labs here on Earth.
updated 12/5/2012 12:44:13 PM ET 2012-12-05T17:44:13

The unmanned rover that NASA plans to launch toward Mars in 2020 should gather up Red Planet rocks and dirt for delivery to Earth someday, some experts say.

NASA science chief John Grunsfeld announced the new rover here Tuesday at the annual fall meeting of the American Geophysical Union. Details of the roughly $1.5 billion mission have yet to be worked out, but some big names in the Mars community are already pushing hard for a sample caching system.

"I hope and expect that its main mission will be to collect and cache a well-chosen set of samples for eventual return to Earth," Steve Squyres of Cornell University, principal investigator for NASA's Opportunity Mars rover, told via email.

"This was clearly identified as the top priority for Mars exploration by the recent Planetary Decadal Survey, and this 2020 rover has the potential to do that job," Squyres added, referring to a 2011 report by the U.S. National Research Council (NRC) that outlines the scientific community's goals for planetary science over the coming decade. Squyres led the committee that produced the survey. [Video: NASA to Launch Mars Rover in 2020]

Former "Mars czar" Scott Hubbard, who restructured NASA's Red Planet program after it suffered several high-profile failures in the late 1990s, echoed Squyres' sentiments.

"I’m delighted to see the Obama administration lay out a plan to return a NASA rover to the surface of Mars in 2020," Hubbard, who's currently at Stanford University, said in a statement. “If a caching system is included, we can begin moving toward a sample-return campaign, as recommended" by the NRC.

Bringing pieces of the Red Planet back to Earth would allow researchers to examine them in fully equipped laboratories, which many scientists regard as the best way to search for signs of Martian life.

Grunsfeld said NASA wants the 2020 rover — whose chassis and landing system will be based heavily on the agency's Curiosity rover, which landed on Mars Aug. 5 — to help pave the way for sample-return.

But he doesn't know if it will feature a caching system. That determination is up to the "science definition team," which will be meeting over the next few months to map out the new rover's mission.

"The question of caching is going to be a trade-off case," Grunsfeld said. "The science definition team is going to have to weigh, what science do we want to get done? How much mass and power do we have available? What can we get to the surface, and where do we want to go?"

Ray Arvidson, deputy principal investigator for the Opportunity rover and a participating scientist on Curiosity's mission, also hopes the new rover has a caching capability. But he says the 2020 mission will likely be a step toward sample-return no matter what its goals turn out to be.

"Anything we do on the surface, in my view, gets toward sample-return, particularly if we can tweak the payload — and it can be the engineering elements — that rehearse some of the things we want to do for sample-return," Arvidson, who's based at Washington University in St. Louis, told

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"That includes what measurements to make to select the right samples, and anything that we can do in terms of acquisition, handling and packaging," Arvidson added. "Do that, and we're moving toward sample-return."

Arvidson also stressed how exciting it is to have another rover mission launching toward the Red Planet in 2020, given the funding situation of NASA's Mars program. The program suffered a 20 percent cut in the White House's proposed 2013 budget, forcing the agency to downscale and rethink its Red Planet plans.

"This is good news, really good news," Arvidson said.

Follow senior writer Mike Wall on Twitter @michaeldwallor @Spacedotcom. We're also on  Facebook  and  Google+.

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