/r/askscience
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How did Einstein figure out relativity in the first place? What problem was he trying to solve? How did he get there?
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In as simple a way as possible, how are we able to tell the elementary make up of a planet using only a telescope?
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Can a star sit barely on the edge of being able to support fusion such that it will actually oscillate through fusion cycles?
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Mark as read: Add to a list