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When NASA first started planning the Kepler mission, no one knew if the universe held any planets outside our solar system. Thousands of exoplanets later, the search enters a new phase.

For centuries, humans have wondered about the possibility of other Earths orbiting distant stars.

An extraordinary astronomical phenomenon that will not happen again until 2037.

If you’re braving the “friendly,” crowded skies this holiday season, brace yourself for the inevitably glacial pace of the boarding process.

Over the course of two decades, several thousand planets have been discovered and recorded. Most of these exoplanets look nothing like the planets in our Solar System. Dr. Steffen, a member of the science team for NASA’s Kepler mission, joins us to talk about these discoveries and what we’ve learned from them.