Photos: Knut's Half-Sibling Born at Zoo
Anori, Knut's half-sibling born at German Zoo

First Earth-Size Planets Found in Space
Scientists using NASA's Kepler space telescope say they have found two planets orbiting a distant star -- and say the planets are the first ever that are the size of Earth or smaller. That could be critical in the search for extraterrestrial life.

Watch: Megaupload: Web Site Hit by Feds
Justice Department indicts two companies behind the file-sharing site.

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Photos: The Ancient Oceans of Mars
A star nursery, the aurora as seen from the International Space Station in orbit, a storm on Saturn as big as Earth, a spectacular solar flare, and images of the cosmos from the Hubble Space Telescope.

Photos: One Last Look Inside Space Shuttle
American space flight over 50 years, from the selection of the first NASA astronauts to the final flight of the space shuttle.