Brian Cox examines why, despite billions of stars and trillions of planets, we have found no evidence of other intelligent life.

Military satellite research brought us GPS. Astronomers influenced medical imaging tech. What would be invented after we discover alien life? Professor Sara Seager explains the consequences of such a groundbreaking discovery.

“So many things could have happened in a different way that we wouldn't be here at all, both individually, for sure, and certainly as a species.”

"Many astronomers are really driven by the search for Earth twins because I think deep down the natural endpoint of this whole goal of looking for planets is to answer the question, are we alone?"

“We wouldn’t be able to talk about minerals if it weren’t for the minerals themselves.” Mineralogist Bob Hazen explains how Earth’s rocks can teach us about our planet’s technicolor history.

The mind-blowing theory that everything is evolving—from minerals to music—explained in 3 minutes by a Carnegie scientist.

“I study the mineral kingdom — and its secrets could lead us to alien life.”