Photos:

Best Space Photos of the Week - Dec. 21, 2013

PREVIOUS | NEXT
1 of 9

Europe's Galaxy-Mapping Gaia Spacecraft Blasts Off

Credit: ESA–S. Corvaja, 2013
The European Space Agency's Gaia probe launched on Dec. 19, beginning a five-year space mission during which it will precisely map 1 billion Milky Way Stars. [Read Full Story]
More from Space.com