Video Series Tribute to Carl Sagan
“The Backbone of Night” Pt 7 of 20
New estimate for alien Earths: 2 billion in our galaxy alone
Scientists are seeking out worlds that are roughly the size of Earth and are the right distance from their suns to have liquid water on the planet.
Stunning photo shows colliding galaxies forming exclamation point in space
Collision provides a model for how the Milky Way and Andromeda galaxies will merge billions of years from now.
