Lately I've been learning quite a lot about spacetime, black holes, light, gravity, and other neat things. Minkowski came up with an interesting diagram to show how space and time interplay. http://en.wikipedia.org/wiki/Minkowski_space

When we look up at the brilliant night sky, we're viewing the past. http://en.wikipedia.org/wiki/Worldline#World_lines_in_special_relativity

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