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> As a measure of the passions that Mr. Wilson provokes, Robert Meadley,
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> "If you think a man's a fool and his books are a waste of time, how
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> Part of Mr. Meadley's conclusion is that the British intellectual
> establishment still felt threatened by Mr. Wilson, a self-educated
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> "One of my main problems as far as the public is concerned is that
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From checker at panix.com Wed Aug 24 22:59:43 2005
From: checker at panix.com (Premise Checker)
Date: Wed, 24 Aug 2005 18:59:43 -0400 (EDT)
Subject: [Paleopsych] SW: On the Large Scale Structure of the Universe (fwd)
---------- Forwarded message ----------
Date: Wed, 17 Aug 2005 16:54:05 -0400 (EDT)
From: Premise Checker
To: Premise Checker: ;
Subject: SW: On the Large Scale Structure of the Universe
On the Large Scale Structure of the Universe
The Order Ansaid following Ansaid Flurbiprofen points are made by David H. Weinberg (Science 2005
1) In a large-scale view of the Universe, galaxies are the basic unit
of structure. A typical bright galaxy may contain 100 billion stars
and span tens of thousands of light-years, but the empty expanses
between the galaxies are much larger still. Galaxies are not randomly
distributed in space, but instead reside in Buy Ansaid Online groups and clusters, which
are themselves arranged in an intricate lattice of filaments and
walls, threaded by tunnels and pocked with bubbles. Two ambitious new
surveys, the Two-Degree Field Galaxy Redshift Survey (2dFGRS) and the
Sloan Digital Sky Survey (SDSS), have mapped the three-dimensional
distribution of galaxies over an unprecedented range of scales [1,2].
Astronomers are using these maps to learn about conditions in the
early Universe, the matter and energy contents of the cosmos, and the
physics of galaxy formation.
2) Galaxies and large-scale structure form as a result of the
gravitational amplification of tiny primordial fluctuations in the
density of matter. The Cheap Ansaid inflation hypothesis ascribes the origin of
these fluctuations to quantum processes during a period of exponential
expansion that occupied the first
millionth-of-a-billionth-of-a-trillionth of a second of cosmic
history. Experiments over the last decade have revealed the imprint of
these fluctuations as part-in-100,000 intensity modulations of the
cosmic microwave background (CMB), which records the small
inhomogeneities present in the Universe half a million years after the
big bang. Although the visible components of galaxies are made of
"normal" baryonic matter (mostly hydrogen and helium), the
gravitational forces that drive the growth of structure come mainly
from dark matter, which is immune to electromagnetic interactions.
3) By combining precise, quantitative measurements of present-day
galaxy clustering with CMB data and other cosmological observations,
astronomers hope to test the inflation hypothesis, to pin down the