Bringing Mars rocks to Earth and a mission to Jupiter's icy moon, Europa, should be among the top priorities for NASA in the coming decade, a high-level panel of planetary scientists has suggested.

The National Research Council, which released a to-do list for NASA for the decade 2013-2022, also said if the US space agency cannot afford such multi-billion-dollar “flagship missions”, they should be delayed in favour of smaller ones, the New Scientist reported.

In its decadal survey of planetary science missions, the council recommended that NASA should make a Mars sample return mission its top priority among its large planetary science missions.

Bringing back samples

Bringing Martian rocks back to Earth, it said, would allow scientists to study them with a much wider array of instruments than can be packaged on a Martian rover. That in turn would allow scientists to better search for signs of past or present life, the report noted. This scores over sending rovers to the Red Planet.

The panel's second-highest priority for large missions is a probe that would orbit Europa, thought to harbour an ocean of liquid water beneath its surface.

The mission, the panel said, would help assess the moon's potential for hosting life by trying to confirm the presence of an ocean and determining how far the ocean lies below the moon's icy surface. — PTI