Dr . Wendy L . Freedman of the Carnegie Observatories in Pasadena, Calif ., reported that subsequent Hubble telescope observations of pulsating stars of known intrinsic brightness, known as Cepheids, were giving somewhat lower expansion rates _ 73 kilometers per second per megaparsec, plus or minus 6.
22.
By combining this number with the galaxy's recession velocity, a much easier number to obtain, Dr . Freedman and her colleagues inferred a value for the Hubble constant of 80 plus or minus 11 miles per second per megaparsec ( a megaparsec is 3.26 million light-years ).
23.
By combining this number with the galaxy's recession velocity, a much easier number to obtain, Dr . Freedman and her colleagues inferred a value for the Hubble constant of 80 plus or minus 11 miles per second per megaparsec ( a megaparsec is 3.26 million light-years ).
24.
The Key Project had arrived at a constant of 70 plus or minus 10 percent ( the expansion rate expressed in kilometers per second per megaparsec ), which put the age of the universe at 12 billion years, while Sandage's most recent result was 58 plus or minus 10 percent, or an age of 15 billion years.
25.
The constant just tells us how much that average speed changes per megaparsec of separation from us . ( It's not just us; if you were in a galaxy far, far away, it would be the same . ) There is no Hubble spacecraft, AFAIK, just the Hubble Space Telescope, which is named after him . talk ) 05 : 19, 1 November 2014 ( UTC)
