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Photos: Anniversary of NASA's Worst Tragedies
Late January is always a dark time of year for NASA's astronaut program; the anniversaries of its three worst accidents all happen in the same week. The Apollo 1 astronauts died in a cockpit fire on Jan. 27, 1967. The space shuttle Challenger exploded 73 seconds after liftoff Jan. 28, 1986. And the space shuttle Columbia broke up on return to earth Feb. 1, 2003.

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.

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: CES in 60 Seconds: Sony Xperia LTE Phone
A first look at Sony's upcoming 4g mobile device.

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