People say that travelling is dangerous, for example, driving a car. They point to the fact that there are so many cars on the roads that the chances of an accident are very high. But that’s nothing compared to Space. Space will soon be so dangerous to travel in that only a mad man would even try. The reason is simple; ever since we started exploring Space in the late 1950s we have been leaving things up there. There is now so much rubbish circling the Earth that from a distance our planet appears to have a ring around it, making it look a bit like Saturn. Unless we start cleaning up after ourselves, we are in danger.
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Независимый причастный оборот в английском языке выполняет в предложении роль обстоятельства времени, причины или условия и отделяется от главной части предложения запятой.