Extras
Early Earth Bombarded By Comets
Comets carrying chemicals necessary for life may have come to Earth billions of years ago.
Early Earth Bombarded By Comets
NASA’s Kepler mission lets us search for planets orbiting stars outside our solar system.
Hunting Planets
Scientists discover evidence for the key ingredients for life on Saturn's moon Enceladus.
Is There Life on Enceladus?
Finding Life Beyond Earth Preview
Scientists are on the verge of answering one of the greatest questions: Are we alone?
Finding Life Beyond Earth Preview
Watch an uncut interview with the late astronaut, conducted at NASA in 1984.
An Interview with Sally Ride
NASA is sending a robotic rover called "Curiosity" to find out if there is life on Mars.