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Latest Gravitational lensing Stories

fe49476d7ff2b9795b09f32d438085fc1
2010-08-19 14:52:35

Astronomers have devised a new method for measuring perhaps the greatest puzzle of our universe "” dark energy. This mysterious force, discovered in 1998, is pushing our universe apart at ever-increasing speeds.For the first time, astronomers using NASA's Hubble Space Telescope were able to take advantage of a giant magnifying lens in space "” a massive cluster of galaxies "” to narrow in on the nature of dark energy. Their calculations, when combined with data from other...

8a90643cf6888275ab6c96410e9e1eda
2010-07-16 07:58:07

Astronomers at the California Institute of Technology (Caltech) and Ecole Polytechnique F©d©rale de Lausanne (EPFL) in Switzerland have discovered the first known case of a distant galaxy being magnified by a quasar acting as a gravitational lens. The discovery, based in part on observations done at the W. M. Keck Observatory on Hawaii's Mauna Kea, is being published July 16 in the journal Astronomy & Astrophysics. Quasars, which are extraordinary luminous objects in the distant...

1ff02c5f2a78a35cc9b26a407f0b990b1
2010-05-05 09:05:00

A new wide-field image released today by ESO displays many thousands of distant galaxies, and more particularly a large group belonging to the massive galaxy cluster known as Abell 315. As crowded as it may appear, this assembly of galaxies is only the proverbial "tip of the iceberg", as Abell 315 "” like most galaxy clusters "” is dominated by dark matter. The huge mass of this cluster deflects light from background galaxies, distorting their observed shapes slightly. When...

06085b6db9a6a6e2518b778798490e9d1
2010-03-25 07:35:00

A group of astronomers [1], led by Tim Schrabback of the Leiden Observatory, conducted an intensive study of over 446 000 galaxies within the COSMOS field, the result of the largest survey ever conducted with Hubble. In making the COSMOS survey, Hubble photographed 575 slightly overlapping views of the same part of the Universe using the Advanced Camera for Surveys (ACS) onboard Hubble. It took nearly 1000 hours of observations. In addition to the Hubble data, researchers used redshift [2]...

5001c1411ea42692549906de32bd4d7a
2010-03-01 10:45:00

Using entire galaxies as lenses to look at other galaxies, researchers have a newly precise way to measure the size and age of the universe and how rapidly it is expanding, on par with other techniques. The measurement determines a value for the Hubble constant, which indicates the size of the universe, and confirms the age of the universe as 13.75 billion years old, within 170 million years. The results also confirm the strength of dark energy, responsible for accelerating the expansion of...

82254273e52c7c95420fc7866639524e1
2010-01-20 12:20:00

Observations of faint and distant galaxy groups made with the European Space Agency's XMM-Newton observatory have been used to probe the evolution of dark matter. The results of the study are reported in the January 20 issue of The Astrophysical Journal. Dark matter is a mysterious, invisible constituent of the Universe which only reveals itself through its gravitational influence. Understanding its nature is one of the key open questions in modern cosmology. In one of the approaches used to...

868849ad034d367cd193a6de70d7fdf21
2010-01-20 09:27:32

Weak gravitational lensing is a uniquely promising way to learn how much dark matter there is in the Universe and how its distribution has evolved since the distant past. New work by a team led by a cosmologist from the U.S. Department of Energy's Lawrence Berkeley National Laboratory has made major progress in extending the use of gravitational lensing to the study of much older and smaller structures than was previously possible. Until recently, weak lensing had been limited to calculating...

f7a6b9fa12ede153ab756e278a2ac2531
2010-01-06 08:15:00

In their quest to find solar systems analogous to ours, astronomers have determined how common our solar system is. They've concluded that about 15 percent of stars in the galaxy host systems of planets like our own, with several gas giant planets in the outer part of the solar system. "Now we know our place in the universe," said Ohio State University astronomer Scott Gaudi. "Solar systems like our own are not rare, but we're not in the majority, either." Gaudi reported the results of the...

ced1980fd79046a4af1390ef48bcc3c91
2009-06-14 11:40:00

Astronomers have reason to believe that they have witnessed signs of the first planet to be spotted outside of our galaxy. The planet is located in the Andromeda galaxy and is estimated to have a mass six times that of Jupiter. The method of viewing this newly discovered planet is through gravitational lensing, where the light from a very distant, bright source is "bent" around a massive object between the source object and the observer. The team that utilized a type of gravitational...

d5c8f96da0986733dcb4518fca4241431
2009-01-29 09:05:00

Variations in the brightness of the Q0957+561 quasar, also known as the "twin quasar" due to its duplicated image on Earth, are intrinsic to the entity itself and not caused by the gravitational effects of possible planets or stars from a far away galaxy. This is the conclusion of a study carried out by Spanish researchers resolving a mystery that has intrigued astronomers for the past 30 years. The quasar Q0957+561, some 9 billion light years away in the Ursa Major constellation, was...


Latest Gravitational lensing Reference Libraries

67_d2968798d508f86b18fbbe3396553cd4
2010-09-13 16:46:47

The cluster CL0024+17, located in Pisces, is a galaxy cluster that is allowing astronomers to probe the distribution of dark matter in space. Dark matter does not reflect light and therefore cannot be seen. It is only detectable by the way its gravity affects the lights around it. Using gravitational lensing astronomers observe the distorted light around the dark matter and are able to tell where it is located within a cluster. A dark matter ring found near the cluster's center, by...

6_fec4ca0e97baf4ce0833c41b1e6be5e62
2004-10-19 04:45:41

Gravitational Lens -- A gravitational lens is formed when the light from a very distant, bright object (such as a quasar) is "bent" around a massive object (such as a massive galaxy) between the bright object and the viewer. The process is known as gravitational lensing, and was one of the predictions made by Einstein's general relativity. Description In a gravitational lens, the gravity from the massive object bends light as a lens might. As a result, the path of the light from a...

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Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
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