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Crash Course Astronomy | Distances: Crash Course Astronomy #25 | Episode 25 | PBS

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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 find the size of the Earth, and from that the distance to and the sizes of the Moon and Sun.

Tags

Light-year
Parallax
Angle
Telescope
Star
Measure
Shift
Baseline
Earth
Distance

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