Gap Filling Quiz

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Spacecraft provide the conditions needed for astronauts to in space.
They mainly provide three things:
1. An and equipment to remove waste gases such as carbon dioxide.
2. Insulation and heating to provide a suitable for astronauts.
3. Exercise equipment to reduce the effects of . Bones become weaker the longer an astronaut is in space, and helps to slow this process down.

The walls and windows of spacecraft are designed to withstand the impact of 'micrometeorites' which are tiny pieces of fast-moving .
But they cannot protect astronauts from all the radiation in space, which can cause .
This limits how long a mission can last without damaging the of the astronauts.