A Whole New Universe

First we learned the Earth was round. Then we found out we were not at the center of the cosmos, just another planet orbiting the sun. Only 20 years ago came the confirmation of the first planet found to be orbiting another star. Now it's 5,000 exoplanets and counting, and our view of the universe has, once again, changed forever.

Credit

NASA/JPL-Caltech

ENLARGE