Thursday, 19 December 2013

Astronomy Scrapbook Friday 20th December 2013

On This Day (1)
December 20th 1996
 Carl Sagan died.


Carl Sagan was one of the best known popularisers of astronomy and cosmology.  He is best known for the award winning Cosmos TV series in 1980.

On This Day (2)
December 20th 1896
Walter S Adams was born.



 He worked on solar spectroscopy and co-discovered a relationship between the relative intensities of certain spectral lines  and the absolute magnitude of a star. He was able to show that spectra could be used to determine whether a star was a giant or a dwarf.

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