NASA says that it has identified only two asteroids that appear to be suitable destinations for astronauts in the next 20 years, but it says more could emerge as it gains knowledge about objects that pass within 28 million miles of Earth. President Barack Obama has set a goal of a manned mission reaching an asteroid by 2025, and a mission requires an asteroid that is large enough and that astronauts could reach within a few months of launch from Earth.

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