Moon geology could solve three mysteries of early Earth
Monday, December 8, 2008 - 12:15
in Astronomy & Space
(PhysOrg.com) -- Not much is known about the Earth before 4 billion years ago, the earliest period in the planet`s 4.5-billion-year history. Because Earth has lost almost all geological records of this era from its surface, it`s often considered the planet`s dark ages.