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Pastimes : Quantum Physics -- or -- Physics Revisited
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To: Tom Clarke who wrote (10)4/26/2000 8:05:00 PM
From: JayPC  Read Replies (2) of 228
 
A flat universe?

news.excite.com

Scientists Say Universe Is Flat But Growing

Updated 2:11 PM ET April 26, 2000

LONDON (Reuters) - Intrepid sailors long ago proved the earth was
round, but now Italian cosmologists say it is the ever-expanding
universe that is as flat as a pancake.

By measuring variations in ancient radiation from the Big Bang with a
microwave telescope carried high above Antarctica by a balloon, the
researchers said their "temperature map" was "consistent with a flat,
Euclidean Universe."

Detailing their findings in the latest issue of Nature, Professor P de
Bernardis of the Rome University and his international team tracked the
blizzard of photons created when the cosmos emerged 10 to 20 billion
years ago.

The photons -- formed with atomic hydrogen as the cosmos heated and
then released to travel freely as it cooled -- still abound as cosmic
microwave background (CMB), the source of about one percent of the
noise on television sets.

Commenting on the article, Wayne Hu of the Institute for Advanced
Studies, School of Natural Sciences in New Jersey said "temperature
maps of the CMB form a snapshot image of the Universe when it was
extremely young."

"The...result supports a flat universe, which means that the total mass
and energy density of the universe is equal to the so-called critical
density," Wu wrote.

"A perfectly flat universe will remain at the critical density and keep on
expanding forever, because there is not enough matter to make it
recollapse in a 'big crunch'."
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