Researchers in South Korea succeeded in extracting stem cells from a cloned human embryo.
NASA's robotic rover, fully recovered from computer problems that plagued it for more than two weeks, drilled into a Martian rock over the weekend in search of evidence that water once flowed on the arid planet.
NASA celebrated the successful landing of its second rover, Opportunity, Saturday night on the opposite side of Mars from its twin rover, Spirit.
Europe's Mars orbiter has found the most direct evidence yet of water in the form of ice in the south polar cap of Mars, the European Space Agency announced Friday.
NASA's rover Spirit has failed to transmit data from Mars for more than 24 hours in what mission scientists thought at first was a weather-related interruption but now believe could be a serious hardware or software problem.
By PBS NewsHour
NASA has said it will no longer service the Hubble Space Telescope, which has been relaying spectacular images of celestial objects from its orbital vantage point for more than ten years.
Nearly two weeks after its arrival on Mars, the robotic rover Spirit rolled off its landing platform Thursday for its first trip onto Martian soil.
President Bush announced plans Wednesday to develop a new spacecraft to send humans back to the moon as early as 2015 and use it as a launching point for manned missions to Mars and beyond.
A study published Thursday in the journal Science found that farm-raised salmon contain significantly more cancer-causing pollutants than those caught in the wild.
The robotic explorer Spirit successfully landed on Mars Saturday night and immediately began transmitting images of its surroundings, a long-dried up lake bed where scientists are seeking evidence that life once existed on the red planet.
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