This artist's rendering provided by Ball Aerospace/B612 Foundation Sentinel Mission shows the Sentinel Space Telescope which the nonprofit B612 Foundation wants to launch. The group of ex-NASA astronauts and scientists on Thursday, June 28, 2012 announced they plan to launch a privately-funded space telescope to search for small asteroids that may pose a danger to Earth. (AP Photo/Ball Aerospace/B612 Foundation Sentinel Mission)

Associated Press
This artist's rendering provided by Ball Aerospace/B612 Foundation Sentinel Mission shows the Sentinel Space Telescope which the nonprofit B612 Foundation wants to launch. The group of ex-NASA astronauts and scientists on Thursday, June 28, 2012 announced they plan to launch a privately-funded space telescope to search for small asteroids that may pose a danger to Earth. (AP Photo/Ball Aerospace/B612 Foundation Sentinel Mission)
This artist's rendering provided by Ball Aerospace/B612 Foundation Sentinel Mission shows the Sentinel Space Telescope which the nonprofit B612 Foundation wants to launch. The group of ex-NASA astronauts and scientists on Thursday, June 28, 2012 announced they plan to launch a privately-funded space telescope to search for small asteroids that may pose a danger to Earth. (AP Photo/Ball Aerospace/B612 Foundation Sentinel Mission)
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