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Zeroing in on Hubble's constant

Date- 5th Jan 09 Source- http://www.ciw.edu/multimedia_content 'In the early part of the 20th Century, Carnegie astronomer Edwin Hubble discovered that the universe is expanding. The rate of expansion is known as the Hubble constant. Its precise value has been hotly debated for all of the 80 intervening years. The value of the Hubble constant is a key ingredient in determining the age and size of the universe.' More info- http://www.ciw.edu/news/zeroing_hubble_s_constant
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