8.8 billion habitable Earth-size planets exist in Milky Way alone
Monday, November 4, 2013 - 18:30
in Astronomy & Space
WASHINGTON — Space is vast, but it may not be so lonely after all: A study finds the Milky Way is teeming with billions of planets that are about the size of Earth, orbit stars just like our sun, and exist in the Goldilocks zone — not too hot and not too cold for life.