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Lectures 7 & 8

Lectures 7 & 8 - Parallax Thursday 1:47 PM 1 The...

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Parallax Thursday, February 18, 2010 1:47 PM 1. The limits of parallax o Helped astronomers figure out that Andromeda is a galaxy larger than ours and further away than they originally thought, and not a nebula 2. What are parsecs used to measure? o Distance o Time o Speed 3. Star A has a larger parallax than star B. Which is closer? o Star A o Star B 4. Two stars have the same temperature and luminosity, but one is 10 light years from the Earth, and the other is 1000 light years away. The more distant star appears to be o 10x fainter o 100x fainter o 10,000x fainter (Inverse square law) o 100,000,000x fainter o The same brightness 5. Mars is approx twice as far from the sun as Venus... o One quarter 6. Magnitudes of Stars o Divisions like in sports, the 1st is the best o Eyes are good at seeing in logarithmic scales, whereas cameras only see in linear scales (like taking pictures of the sun or in a dark room-- hard for camera to deal with high contrasts) 1. Is the sun a typical star?
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