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Astronaut Scott Kelly blasts off on yearlong space station mission

Astronaut twins make space history as NASA launches landmark experiment

NASA's Curiosity rover on Mars sidelined by 'short circuit' glitch

Mars has flowing liquid water, NASA confirms

European astronaut uses 'the Force' to control rover from space

Elon Musk's answer to making Mars more like Earth? Just nuke it

Yearlong mock Mars mission will test mental toll of isolation

US needs a Mars colony, Buzz Aldrin tells senators

Private Mars One colony project cuts applicant pool to 100 volunteers

The Force is with them: NASA unveils 'Star Wars'-themed astronaut portrait