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Unformatted text preview: • Jupiter is an M&M in the back row, • proxima centauri would be in San Francisco If the sun were a grain of sand • proxima centauri is near el con • Cent of the galaxy is 40,000 miles away Apparent or angular size: Ø= D/d The distance ladder: • What is this AU: o Initially, solar system size scales only determined in a relative sense. Copernicus did this in the early 1500s o The AU was an arbitrary unit until the distance to one of the planets could be measured o Trigonometric parallax 1671: 10% accuracy o transit of Venus ~1770: 10% accuracy o radar raging ~1970: 10^(-8) accuracy...
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- Spring '09
- Astronomical unit, Light-year, Proxima Centauri, Parsec, distance Sun-Proximia centauri