NASA Seeks Alien Planets

NASA's on the hunt for aliens. The agency's Deep Impact spacecraft is being sent to observe five nearby stars with "transiting exosolar planets."

"We're on the hunt for planets down to the size of Earth, orbiting some of our closest neighboring stars," said Drake Deming of NASA's Goddard Space Flight Center in Greenbelt, Md. And if they're the size of Earth, maybe they're kind of like Earth, and if they're like Earth, well...