Wednesday 12/7 CNN

posted Dec 7, 2011, 2:38 AM by Erik Mylenek   [ updated Dec 9, 2011, 2:53 AM ]
What have scientists recently discovered about Kepler-22b? According to the report, what does it mean if a planet is said to be in a "habitable zone"? Why might scientists be interested in whether a planet is in this zone?