After the explosion of the Columbia shuttle in 2003, two American astronauts aboard the International Space Station suddenly found themselves with no ride home.

Forty-five years ago, Buzz Aldrin became the second man to walk on the moon. It made him one of the most famous people in the world. And it has haunted the rest of his life.

How two Italian teenagers hacked the Soviet space program and may have heard the dying breaths of a lost cosmonaut.