Earlier this week, astronomers from University of California in Santa Cruz announced the discovery of an Earth-sized world in a very promising spot around the red-dwarf star known as Gliese 581. It seems to be orbiting in that star's habitable zone.
Watch this vid for the complete announcement:
http://www.youtube.com/watch?v=ZwNMg5JB_ic
Also Space Fans: Please use the new moderator thingy on my channel to vote on video ideas.