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3d8caad10cffe08b1f717809a04eab441
2008-09-20 09:00:00

A Unique Way to Measure Dark Energy With Galaxies and Quasars The Sloan Digital Sky Survey (SDSS) uses a 2.5-meter telescope with a wider field of view than any other large telescope, located on a mountaintop in New Mexico called Apache Point and devoted solely to mapping the universe. We now know that some three-quarters of the universe consists of dark energy, whose very existence was unsuspected when telescope construction began in 1994 and still controversial when the first Sloan survey...

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2008-09-04 14:15:00

Researchers have recently sought to find evidence of antimatter in the form of large clusters of hundreds of galaxies.  Research suggests that if large amounts of antimatter exist, it may have been pushed far into the universe shortly after the big band occurred. Antimatter has the same mass as matter but contains an opposite charge. Experts hypothesize that matter and antimatter should have been created in equal amounts. However, scientists say that our universe is only made up of...

431ed411c84af08581a9fa433a1db9591
2008-08-29 08:45:00

Breakthrough helps researchers better understand mysterious dark matter By analyzing light from small, faint galaxies that orbit the Milky Way, UC Irvine scientists believe they have discovered the minimum mass for galaxies in the universe "“ 10 million times the mass of the sun. This mass could be the smallest known "building block" of the mysterious, invisible substance called dark matter. Stars that form within these building blocks clump together and turn into galaxies. Scientists...

f10c9b984aa1203f99032b6c097744a41
2008-08-01 09:40:00

In the beginning, scientists say the first star to appear after the Big Bang quickly grew into a monster 100 times more massive than the sun. U.S. and Japanese researchers say the first cosmological object formed in the universe was a tiny protostar with a mass of about 1 percent of our sun. Scientists spent years developing a complex computer simulation of what it was like after the Big Bang that formed the universe. "The first stars were very different from stars like the sun," explained...

2008-06-17 03:00:15

By Cowen, Ron Scientists propose tests of Copernican principle For all the hand wringing among physicists about the nature of dark energy, the invisible stuff that appears to be revving up the rate of cosmic expansion, a nagging possibility remains. Dark energy could be acosmic mirage - if humans live in a special place in the universe having a peculiar distribution of matter. If Earth and its environs are centered in a vast, billion-light- year-long bubble, relatively free of matter, and...

0314e3d59159e5cfaf4cc20ec2fde676
2008-06-08 15:25:00

In recent studies, physicists may have not only found a new model for the creation of our universe, they may also have found an entirely new view on time altogether. The journal Physical Review Letters shares details about a recent study of the cosmic microwave background "“ light emitted when the universe was only 400,000 years old. It is relic radiation that fills the universe and acts as evidence for the Big Bang theory. In 1992 the Cobe satellite discovered tiny fluctuations on the...

e13aa48bfa7aa6d82f485d593fc1bf3d1
2008-05-26 09:45:00

Aim to produce new generation of astronomer that understands theory and observationThe future of fundamental physics research lies in observing the early universe and developing models that explain the new data obtained. The availability of much higher resolution data from closer to the start of the universe is creating the potential for further significant theoretical breakthroughs and progress resolving some of the most difficult and intractable questions in physics. But this requires much...

027471b92b33a7323534efd746a1273d1
2008-05-20 16:30:00

Although the universe contains billions of galaxies, only a small amount of its matter is locked up in these behemoths. Most of the universe's matter that was created during and just after the Big Bang must be found elsewhere. Now, in an extensive search of the local universe, astronomers say they have definitively found about half of the missing normal matter, called baryons, in the spaces between the galaxies. This important component of the universe is known as the "intergalactic medium,"...

4892ff893d3ee25dc9e6de8e23fc6f6e
2008-05-13 09:40:00

First accurate measurement of the temperature of the cosmic background at an early epochAstronomers have made use of ESO's Very Large Telescope to detect for the first time in the ultraviolet the carbon monoxide molecule in a galaxy located almost 11 billion light-years away, a feat that had remained elusive for 25 years. This detection allows them to obtain the most precise measurement of the cosmic temperature at such a remote epoch.The team of astronomers [1] aimed the UVES spectrograph on...

72009f359904d77b6cf776f2a1a26b861
2008-04-29 08:30:00

Imagine receiving an announcement touting the birth of a baby 20 inches long and weighing 180 pounds. After reading this puzzling message, you would immediately think the baby's weight was a misprint. Astronomers looking at galaxies in the universe's distant past received a similar perplexing announcement when they found nine young, compact galaxies, each weighing in at 200 billion times the mass of the Sun. The galaxies, each only 5,000 light-years across, are a fraction of the size of...


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Cosmology
2014-01-12 00:00:00

Image Caption: The Hubble Extreme Deep Field (XDF) was completed in September 2012 and shows the farthest galaxies ever photographed by humans. Each speck of light in the photo is an individual galaxy, some of them as old as 13.2 billion years; the observable universe is estimated to contain more than 200 billion galaxies. Credit: NASA/Wikipedia What is Cosmology? I once commented to an acquaintance that I was fascinated by the field of Cosmology, and mused that if I had more time, I...

8_2c71772f2c3a31994d5208d4518632495
2004-10-19 04:45:44

Large-Scale Structure of the Cosmos -- Stars are organised into galaxies which in turn appear to form clusters and superclusters, separated by voids. Prior to 1989 it was commonly assumed that the superclusters were the largest structures in existence, and that they were distributed more-or-less uniformly throughout the universe in every direction. However, in 1989, Margaret Geller and John Huchra discovered the "Great Wall", a sheet of galaxies more than 500 million light years long...

8_67ff07d77c86523b0eab2955b9ab43e02
2004-10-19 04:45:44

Cosmology -- area of science that aims at a comprehensive theory of the structure and evolution of the entire physical universe. Modern Cosmological Theories Present models of the universe hold two fundamental premises: the cosmological principle and the dominant role of gravitation. Derived by Hubble, the cosmological principle holds that if a large enough sample of galaxies is considered, the universe looks the same from all positions and in all directions in space. The second point...

6_c01dfaf162273609e19b80ea97407cf52
2004-10-19 04:45:42

Redshift -- Redshift is the phenomenon that the frequency of light when observed, under certain circumstances, can be lower than the frequency of light when it was emitted at the source. This usually occurs when the source moves away from the observer, as in the Doppler effect. More specifically, the term redshift is used for the observation that the spectrum of light emitted by distant galaxies is shifted to lower frequencies (towards the red end of the spectrum, hence the name) when...

6_0ba47eab12382e6a4e2cc12b1c7ddf782
2004-10-19 04:45:42

Quasar -- A quasar (from quasi-stellar radio source) is an astronomical object that looks like a star in optical telescopes (i.e. it is a point source), but has a very high redshift. The general consensus is that this high redshift is cosmological, the result of Hubble's law and that their redshift indicates that they are typically very distant from Earth; we observe them as they were several billions of years ago. Since we can see them despite their distance, they must emit more...

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Word of the Day
monteith
  • A large punch-bowl of the eighteenth century, usually of silver and with a movable rim, and decorated with flutings and a scalloped edge. It was also used for cooling and carrying wine-glasses.
  • A kind of cotton handkerchief having white spots on a colored ground, the spots being produced by a chemical which discharges the color.
This word is possibly named after Monteith (Monteigh), 'an eccentric 17th-century Scotsman who wore a cloak scalloped at the hem.'
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