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1. Nasa may equip ships with special habitats

2. Spacecraft may draw energy from the sun

3. Spacecraft can use supersonic retropropulsion

Explanation:

spacecraft expose dangerous level's of radiation to astronauts: Nasa may equip ships with special habitats.

spacecraft cannot refuel in deep space: spacecraft may draw energy from the sun.

large spacecraft are difficult to land safely: spacecraft can use supersonic retro propulsion.

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