Watch: Baltic Sea Discovery Leads to UFO Chatter
Disc-shaped object resembles Millennium Falcon from 'Star Wars.'

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: Mysteries of the Northern Lights
David Muir gives a little insight into what creates those amazing auroras.

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

Watch: Artist Tells Proposal Tale Through Legos
Walter Thompson re-enacts love story with stop-motion.