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Nineteenth and Twentieth Century Clouds Over the Twenty-First Century Virtual Observatory
P. J. E. Peebles
Physical science has changed in the century since Lord Kelvin's celebrated essay on Nineteenth Century Clouds over the Dynamical Theory of Heat and Light, but some things are the s…
From Precision Cosmology to Accurate Cosmology
P. J. E. Peebles
This is the dawning of the age of precision cosmology, when all the important parameters will be established to one significant figure or better, within the cosmological model. In…
The Cosmological Constant and Dark Energy
P. J. E. Peebles, Bharat Ratra
Physics invites the idea that space contains energy whose gravitational effect approximates that of Einstein's cosmological constant, Lambda; nowadays the concept is termed dark en…
When did the Large Elliptical Galaxies Form?
P. J. E. Peebles
The simple reading of the evidence is that the large elliptical galaxies existed at about the present star mass and comoving number density at redshift z=2. This is subject to the…