clipped from: news.bbc.co.uk   

Galaxy has 'billions of Earths'

Fomalhaut star and exoplanet (AFP/Getty)
There could be one hundred billion Earth-like planets in our galaxy, a US conference has heard.

Dr Alan Boss of the Carnegie Institution of Science said many of these worlds could be inhabited by simple lifeforms.

He was speaking at the annual meeting of the American Association for the Advancement of Science in Chicago.