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Another claim is that space exploration is a necessity to mankind and that staying on Earth will lead to extinction. Some of the reasons are lack of natural resources, comets, nuclear war, and worldwide epidemic.
A space probe is a spacecraft which travels into space with no people in it, usually in order to study the planets and send information about them back to earth. Its rings were discovered by telescope from Earth, but space probes later found that spectacular rings surround some other planets. The Pioneer probes have on board ultra-violet instruments which are measuring light that we can't measure on the earth.