Year in Review: Celeste Looks Back on 2011
![](https://media.wnyc.org/i/800/0/c/85/photologue/photos/goldilocks_planet1_h.jpg)
This artist's conception shows the inner four planets of the Gliese 581 system and their host star, a red dwarf star only 20 light years away from Earth.
( Lynette Cook )
( Lynette Cook )