A Nasa animation demonstrates the agency's plan to capture an asteroid in the moon's orbit. The idea is for a robot to catch a small asteroid by pushing or pulling it into a stable orbit. This would allow astronauts to explore the rock and test samples. Nasa hopes to achieve this by 2021. The mission forms part of a long-term goal to send astronauts to Mars
Defend the space base station from asteroids that are about to hit. Do this using your spaceship.
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