Find the latest episode of "The Uncertain Hour" here. Listen

Scott Kelly's new mission is on Earth

The astronaut talks about his life and work in science.
Astronaut Scott Kelly says he's proof that someone who is “far from a genius” can become a scientist.
Bill Ingalls/NASA via Getty Images

What goes up must come down. Or else.

Feb 25, 2016
Space debris poses major risks for the future of space exploration.
Space debris poses major risks for the future of space exploration.
Ethan Miller/Getty Images