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        Distances | Crash Course Astronomy

        How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to determine the the size of the Earth, and from that, the distance to and sizes of the Moon and Sun. Once the distance between the Earth and Sun was found, parallax was used to determine the distance to nearby stars.

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