Astro 20.3 - Astro 101 Chapter 20 Section 3 Hubbles Law...

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Astro 101 Chapter 20 Section 3 Hubble’s Law Spiral galaxy was called spiral nebulae because they thought it was gas Great debate or Shapley Curtis Debate - first two decades of 2nth century - took place in DC on April 26, 1920 - Official topic was The scale of the universe - Shapley argued we are only galaxy, rest are gas - Curtis argued universe is immense and possibly infinite - Neither won - Many years passed, two key pieces of data in Shapley’s argument were wrong - Andromeda’s 1885 nova was actually a supernova - Rotation of M101 was misinterpretation of data Hubble and Andromeda Galaxy - Hubble was invited to Mount Wilson Observatory to join staff - Has world’s largest telescope for 30 years - Hubble instead went to war - Came back few years later and joined - He used Cepheids and found the distance of Andromeda - But he was off by half because there were two types of Cepheids - Leavitt’s period lum relation was for the dimmer type - Hubble observed brighter type -
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This note was uploaded on 12/13/2008 for the course ASTRO 1101 taught by Professor Lloyd,j during the Fall '07 term at Cornell.

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Astro 20.3 - Astro 101 Chapter 20 Section 3 Hubbles Law...

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