SAN FRANCISCO Though NASA is devoting many of its exploration resources to Mars these days, the agency still has its eye on an icy moon of Jupiter that may be capable of supporting life as we know it.

Last week, NASA officials announced that they plan to launch a $1.5 billion rover to Mars in 2020, adding to a string of Red Planet missions already on the docket. The Curiosity rover just landed this past August, for example, and an orbiter called Maven and a lander named InSight are slated to blast off in 2013 and 2016, respectively.

But NASA is also thinking about ways to investigate the possible habitability of Europa, Jupiter's fourth-largest moon. One concept that may be gaining traction is a so-called "clipper" probe that would make multiple flybys of the moon, studying its icy shell and suspected subsurface ocean as it zooms past.

"We briefed [NASA] headquarters on Monday, and they responded very positively," mission proponent David Senske, of NASA's Jet Propulsion Laboratory in Pasadena, Calif., said here Dec. 7 at the annual fall meeting of the American Geophysical Union. [Photos: Europa, Mysterious Icy Moon of Jupiter]

The $2 billion unmanned EuropaClipper, which could be ready to launch by 2021 or so, would also do vital reconnaissance work for a potential lander mission in the future, Senske told SPACE.com.

Intriguing Europa

Astrobiologists regard Europa, which is about 1,900 miles (3,100 kilometers) wide, as one of the best bets in our solar system to host life beyond Earth.

The moon is believed to harbor a large ocean of liquid waterbeneath its icy shell. Further, this ocean is likely in direct contact with Europa's rocky mantle, raising the possibility of all sorts of interesting chemical reactions, Senske said.

The irradiation of Europa's surface and tidal heating of its interior also mean the moon likely has ample energy sources another key requirement for life as we know it.

NASA has long been interested in exploring the icy moon and its ocean. Several years back, the agency drew up an ambitious mission concept called the Jupiter Europa Orbiter(JEO), which would have made detailed studies of Europa and the incredibly volcanic Jupiter moon Io.

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NASA Eyes Mission to Jupiter Moon Europa