Rusty Schweickart, Chairman Emeritus of B612 and former Apollo 9 astronaut, talks about deflection of asteroids with the help of the Sentinel Space Telescope during a news conference in San Francisco, Thursday, June 28, 2012. The group of ex-NASA astronauts and scientists on Thursday announced they plan to launch a privately-funded space telescope to search for small asteroids that may pose a danger to Earth. (AP Photo/Paul Sakuma)

Associated Press
Rusty Schweickart, Chairman Emeritus of B612 and former Apollo 9 astronaut, talks about deflection of asteroids with the help of the Sentinel Space Telescope during a news conference in San Francisco, Thursday, June 28, 2012. The group of ex-NASA astronauts and scientists on Thursday announced they plan to launch a privately-funded space telescope to search for small asteroids that may pose a danger to Earth. (AP Photo/Paul Sakuma)
Rusty Schweickart, Chairman Emeritus of B612 and former Apollo 9 astronaut, talks about deflection of asteroids with the help of the Sentinel Space Telescope during a news conference in San Francisco, Thursday, June 28, 2012. The group of ex-NASA astronauts and scientists on Thursday announced they plan to launch a privately-funded space telescope to search for small asteroids that may pose a danger to Earth. (AP Photo/Paul Sakuma)
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