Scientists cheered NASA's decision to send a new rover to Mars in 2020, but stressed that the mission should pave the way to return Martian rocks to Earth a major goal of the planetary science community.

In a set of statements released Jan. 28 and Jan. 30, two large and well-respected groups of scientists the Planetary Society and the American Astronomical Society's Division for Planetary Sciences (DPS), respectively shared their views on the plan to send another robotic explorer to the Red Planet in seven years.

The new Mars rover missionwas announced Dec. 4 by John Grunsfeld, NASA's associate administrator for science, at the annual meeting of the American Geophysical Union in San Francisco. The new rover will share some design features with NASA's Mars Science Laboratory (MSL) Curiosity rover, which landed on Mars in August to begin at least a two-year mission.

"We welcome the recent announcement that NASA will return to Mars in 2020 with a new rover derived from the MSL Curiosity design," the Planetary Society statement read. "Continued exploration of Mars is crucial to the scientific community and important for building upon our decades-long investment in engineering and technology development. However, we strongly believe that the mission should have the capability to collect and store Martian rock samples as recommended by theNational Research Council's Planetary ScienceDecadalSurvey." [Video: NASA to Launch Mars Rover in 2020]

The Decadal Survey is a report undertaken every 10 years by an independent group of scientists to determine the highest priorities for the field of planetary science (other fields, such as astronomy and astrophysics, have their own surveys). This report is generally well-respected and highly influential in allocating the limited funding within NASA's science budget.

"We strongly believe that the mission should carry a payload consistent with the recommendations given in the National Research Councils decadal survey for planetary science, Vision and Voyages," the DPS statement read. "It is of the utmost importance that NASA and Congress follow the recommendations laid forth in the Decadal Survey in order to maximize science return and support a balanced and affordable approach to exploration in our solar system."

NASA has released scant details on the new rover plan, and it's unclear yet whether the robot will be able to collect Martian rock samples intended to be brought back to Earth. Most plans for returning Mars samples are multi-phase, with an initial mission to collect, or cache, the rocks, and later missions to rendezvous with the collector and return the samples to Earth.

"The question of caching is going to be a trade-off case," Grunsfeld said when he announced the rover. "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?"

Both statements also pushed against budget cuts to NASA's planetary sciencedivision suggested by the Obama administration's February 2012 budget proposal. If implemented, those cuts could force NASA to retire early some of its current solar system probes, such as the Cassini Saturn orbiter and the Messenger Mercury probe, and delay future missions.

"We find the shift in budgetary priority deeply troubling," the Planetary Society scientists wrote. "Namely, it represents a step backwards from our nation's long commitment to exploration and the pursuit of answers to the big questions of 'where do we come from?' and 'are we alone?'"

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Scientists Offer Wary Support for NASA's New Mars Rover