Monday, 9 May 2011
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Thursday, 5 May 2011
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Tuesday, 26 April 2011
Monday, 25 April 2011
Wednesday, 20 April 2011
An Enlightenment Map of the Universe.
1785: Wiliam Herschel uses star count data to map the Milky Way. He assumes:
- all stars have the same brightness
- the galaxy has a uniform density
- he can see to the edge
Friday, 15 April 2011
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