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 Astronomy News

NASA's infrared observatory measures expansion of universe

The Spitzer Space Telescope data brings down the uncertainty of the expansion rate to just 3 percent.
By Jet Propulsion Laboratory, Pasadena, California, NASA Headquarters, Washington, D.C. Published: October 4, 2012
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JAMES D SMITH from WASHINGTON said:
Lonny, redo the calculations, using a value of 3.26156 million light years per magaparsec.
JAMES YATES from OREGON said:
Great article, as always keeping me up to speed with our most recent findings or discoveries.
LONNY D SEVERSON from UTAH said:
If you take 12.5 billion years (furthest galaxy seen per an earlier Astronomy article) divided by 3 million light years (1 megaparsec), you get approx. 4166 megaparsecs to this furthest galaxy. If you multiply that by the new hubble constant, you get approximately 4166 megaparsecs X 46.2 miles/sec/megaparsec=192,469 miles/sec. The speed of light is 186,282 miles/sec so that galaxy is receeding from us at 1.03 times the speed of light. If you take the lower hubble constant (46.2-1.3), then 4166 megaparsecs X 44.9 miles/sec/megaparsec=187,053 miles/sec, or 1.004 times the speed of light. So I guess we better enjoy the view of that galaxy while we can, assuming the arithmetic is right.
STEPHEN ARMSTRONG from CALIFORNIA said:
Does this technique solve the Type 1A supernova-shrouded-in-a-cloud problem, also? A recent Astronomy article stated (paraphrasing) that astronomers would need to be more careful in accounting for surrounding and intervening dust when using them (Type 1A's) for cosmological studies. Has it yet been applied?
RICHARD MCCONNELL from UNITED KINGDOM said:
A great achievement!
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