NASA handout of US astronaut Edwin E. 'Buzz' Aldrin Jr standing on the moon on July 20, 1969. President Barack Obama hailed the astronauts who 40 years ago landed on the moon for the first time and pledged to keep the US space program alive for future generations of Americans(AFP/NASA)SPACE.com - NASA has made a series of critical strides in developing new nuclear reactors the size of a trash can that could power a human outpost on the moon or Mars.



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