President Trump pledges in inaugural address to pursue policy that 'expands our territory' and to put US astronauts on Mars.

NASA’s Curiosity rover is skygazing and photographing lovely examples of noctilucent clouds on Mars. The wispy formations ...

NASA faces rising costs in its Mars Sample Return mission while China races to return Martian samples by 2028, creating a high-stakes space race for scientific dominance.

All the major planets are on view this month. Venus has a fine evening conjunction with Saturn and Jupiter is high in Taurus.

NASA announced Tuesday it may turn to Elon Musk's SpaceX or Jeff Bezos's Blue Origin to help reduce the soaring costs of ...