NASA faces a crucial choice on a Mars spacecraft—and it must decide soon

A consequential debate that has been simmering behind closed doors at NASA Headquarters in Washington, DC, must soon come to a head. It concerns the selection of the next spacecraft the agency will fly to Mars, and it could set the tone for the next decade of exploration of the red planet.

What everyone agrees on is that NASA needs a new spacecraft capable of relaying communications from Mars to Earth. This issue has become especially acute with the recent loss of NASA's MAVEN spacecraft.