NASA's Kepler spacecraft has discovered two Saturn-sized planets transiting the same sun-like star. The same system might contain a third world–a hot "super-Earth" one and a half times the size of Earth–but this is not yet confirmed. Researchers announced the results today at a NASA press conference.

Warning: The Mars Hoax is back–and it's mutating! Read today's story from Science@NASA to find out what's really going to happen in the night sky on August 27th.

NASA's Dawn spacecraft is now less than a year away from giant asteroid Vesta. Today's story from Science@NASA offers a sneak preview of an "alien, unexplored world" that seems sure to amaze.