Two years after President Bush proposed to return astronauts to the moon, NASA announced plans Monday for manned trips there by 2020 and the construction of a permanent base, most likely near the Shackleton crater on the moon's south pole,…

The Mars rover Opportunity reached the rim of the Victoria Crater on Mars, capturing new images of a 900-meter depression that could reveal information about the possibility of life on the Red Planet. Principal scientist Steve Squyres discusses the mission's…

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