Science

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.

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Harvard researchers announced Monday that they have found a way to fuse adult skin cells with embryonic stem cells, which could lead to the creation of stem cells without having to destroy human embryos.

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In light of what they learned from the space shuttle's return to flight and the reoccurring problem of foam breaking off the external fuel tank during takeoff, NASA officials said they will hold off launching the next shuttle until spring…

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The NewsHour Science Unit looks at the debate over scientific research that involves transplanting human stem cells into animal brains.

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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.

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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.

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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.

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Correspondent Spencer Michels reports on the battle over the 100-year-old O'Shaughnessy Dam in Northern California.

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Tom Bearden of the NewsHour's Science Unit takes a look at some upcoming rules on private cattle grazing on public land and the effects they may have.

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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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