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Astronomers Find Clouds Of Primordial Gas From The Early Universe
2011-11-11 04:10:18

For the first time, astronomers have found pristine clouds of the primordial gas that formed in the first few minutes after the Big Bang. The composition of the gas matches theoretical predictions, providing direct evidence in support of the modern cosmological explanation for the origins of elements in the universe. Only the lightest elements, mostly hydrogen and helium, were created in the Big Bang. Then a few hundred million years passed before clumps of this primordial gas condensed to...

Was The Real Discovery Of The Expanding Universe Lost In Translation?
2011-11-10 08:55:02

The greatest astronomical discovery of the 20th century may have been credited to the wrong person. But it turns out to have been nobody's fault except for that of the actual original discoverer himself. Writing in the November 10th issue of the journal Nature, astrophysicist Mario Livio of the Space Telescope Science Institute has put to bed a growing conspiracy theory about who was fairly credited for discovering the expanding universe. For nearly a century, American astronomer Edwin...

Researchers Explain How The Milky Way Killed Off Its Satellites
2011-10-18 08:09:33

Two researchers from Observatoire Astronomique de Strasbourg have revealed for the first time the existence of a new signature of the birth of the first stars in our galaxy, the Milky Way. More than 12 billion years ago, the intense ultraviolet light from these stars dispersed the gas of our Galaxy's nearest companions, virtually putting a halt to their ability to form stars and consigning them to a dim future. Now Pierre Ocvirk and Dominique Aubert, members of the Light in the Dark Ages of...

Image 1 - Cosmic Fog Clears In Distant Galaxies
2011-10-12 09:37:17

[ Watch the Video ] New VLT observations chart timeline of deionization Scientists have used ESO´s Very Large Telescope to probe the early Universe at several different times as it was becoming transparent to ultraviolet light. This brief but dramatic phase in cosmic history – known as deionization – occurred around 13 billion years ago. By carefully studying some of the most distant galaxies ever detected, the team has been able to establish a timeline for deionization...

Scientists Release Most Accurate Simulation Of The Universe
2011-09-30 04:35:17

'Bolshoi' supercomputer simulation provides new benchmark for cosmological studies The Bolshoi supercomputer simulation, the most accurate and detailed large cosmological simulation run to date, gives physicists and astronomers a powerful new tool for understanding such cosmic mysteries as galaxy formation, dark matter, and dark energy. The simulation traces the evolution of the large-scale structure of the universe, including the evolution and distribution of the dark matter halos in...

New Method Could Help Scientists Detect Dark Matter
2011-09-19 13:35:51

  Researchers from Princeton University and New York University have developed a method for detecting the collision of stars with a black hole that could help scientists uncover dark matter. Postdoctoral researchers Shravan Hanasoge of Princeton's Department of Geosciences and Michael Kesden of NYU's Center for Cosmology and Particle Physics simulated the result of primordial black hole passing through a star.  Scientists believe that primordial black holes posses the...

Image 1 - Collisions Not Needed For Star Formation
2011-09-13 09:46:39

  ESA's Herschel infrared space observatory has discovered that galaxies do not need to collide with each other to drive vigorous star birth. The finding overturns this long-held assumption and paints a more stately picture of how galaxies evolve. The conclusion is based on Herschel's observations of two patches of sky, each about a third of the size of the full Moon. It's like looking through a keyhole across the Universe — Herschel has seen more than a thousand galaxies...

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2011-08-03 12:45:00

Researchers have resurrected the theory that other universes lie within "bubbles" of space and time, known as the "Multiverse" theory. Studies of the low-temperature glow left from the Big Bang suggest that these "bubble universes" have left marks on our own. The theory is popular in modern physics, but experimental tests have been hard to perform. A team of scientists used data from the Wilkinson Microwave Anisotropy Probe (WMAP) to help reignite this theory. This probe measures detail of...

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2011-07-26 10:15:00

An Australian PhD student has created the most accurate measurements for determining how fast the Universe is expanding. Florian Beutler, a PhD candidate with the International Center for Radio Astronomy Research (ICRAR) at the University of Western Australia, has calculated how fast the Universe is growing by measuring the Hubble constant. "The Hubble constant is a key number in astronomy because it's used to calculate the size and age of the Universe," Beutler said in a statement. As the...


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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...

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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...

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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...

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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
endocarp
  • The hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed.
This word comes from the Greek 'endon,' in, within, plus the Greek 'kardia,' heart.
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