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NASA's rover Spirit has reached the summit of a bedrock mountain on Mars, and from that vantage point, mission managers will plot the robotic explorer's next move among the numerous intriguing surrounding geologic features.

Mayors across the country have united to pledge support for the Kyoto Protocol despite the Bush administration's concerns the treaty to curb greenhouse gases will hurt the U.S. economy.

Aug 12

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NASA Launches Mars Orbiter

An Atlas V rocket roared into space Friday morning, launching a sophisticated NASA probe on its seven-month journey to Mars from Cape Canaveral Air Force Station in Florida.

An Atlas V rocket roared into space Friday, sending a sophisticated NASA probe on a seven-month journey to Mars. NASA's chief scientist discusses its newest mission to the red planet.

Discovery and its seven astronauts safely landed Tuesday morning at Edwards Air Force Base in California after a two-week mission that involved unexpected repair spacewalks and a visit to the International Space Station.

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