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Apollo 11 astronaut Michael Collins disagrees with NASA's planned Moon return: 'We should shoot directly for Mars'

Douglas MacKinnon: US needs a permanent moon base 鈥� So forget about going to Mars for now

NASA is building robots that can climb Mars, including an 'ice worm'

Fly off to Mars at Kennedy Space Center鈥檚 Astronaut Training Experience

'An exciting time for spaceflight in America': NASA space station astronauts celebrate Independence Day

Michael Guillen: Mars 鈥� Our solar system鈥檚 exasperating little flirt

Marsquakes may be evidence of groundwater

Mars may have hosted life earlier than Earth did, study says

How Martian microbes could survive in the salty puddles of the Red Planet

Elon Musk blasted for mistaking Moon and Mars on Twitter