Alien "Earths" Less Common Than Expected, Study Says

Tuesday, March 29, 2011 - 13:31 in Astronomy & Space

Even at two billion per galaxy, Earthlike worlds are scarcer than expected, according to a new estimate based on NASA data.

Read the whole article on National Geographic

More from National Geographic

Latest Science Newsletter

Get the latest and most popular science news articles of the week in your Inbox! It's free!

Check out our next project, Biology.Net