We all know that astronauts are very brave. That's one reason why we find them ____ Not many of us like the idea of traveling far into space in a ____ metal box! But what are the risks of space travel? Here are just a few of them: There's some radiation here on Earth, but in space, the amounts of radiation are ____. That's one reason why spacesuits are very important. Temperature is another danger in space. It can be ____ sometimes-129°C. But it can also be ____, with temperatures of 121°C. Astronauts won't survive in these temperatures if they don't wear spacesuits. Fire is always a risk on a space mission, and there have been a lot of ____ accidents. For, example, in 1967, three astronauts died in a fire on Apollo 1. Flying around in zero gravity sounds like fun, but the effects on the human body can be ____. Zero gravity can be harmful to the heart, bones, and muscles unless astronauts exercise regularly when they're in space.

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