Mars or Bust: Dennis Tito Plans to Send Couple on 2018 Mission

In 2001 the millionaire Dennis Tito became the first paying space tourist -- he bought a flight to the International Space Station from the Russian space agency. Now he's aiming higher. He and a group of fellow space entrepreneurs announced today that they will try to mount the first-ever flight to Mars, sending a man and a woman to fly past the red planet and return safely in 501 days. And they say they hope to pull it off by 2018 -- just five years from now, and decades earlier than NASA or...Full Story