by 
Chris
ANSWERS: 5
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Because we can only study them from afar. They only happen once, so a lot of study is based on working backwards from the evidence if their remnants. New ones do not seem to give much warning before they pop.
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I was not aware that they were hard to study. What makes you say that?
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1) they are pretty rare. 2) they happen pretty suddenly - by the time we notice one, it's usually all over.
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they are very rare Supernovas
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They are at an extreme distance from Earth.
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