There are many things dangerous about space. And all of them deadly. So it hard to say which one is the most dangerous. There is vacuum, very high temperatures when exposed to the sun (up to 150 C), and very low when in the shadow (down to -120 C), there is lack of oxigen, there are micro meteoroids travelling at very high speeds (up to 30,000 miles/h) and strong radiation coming from the Sun.
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