Gravitational lens


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The universe is all worked up

Gravitational lens
automatic translation
Gravitational lens or gravitational mirage

In astrophysics, a gravitational lens or gravitational mirage is a very massive object (a galaxy cluster for example), which lies between an observer and a light source remote. The gravitational lens imprints a strong curvature of space-time, which has the effect of deflecting all light rays that pass near her, thereby distorting the images received by the observer. The enhancement of the brightness of a celestial object distance by a massive star in front, was predicted by the theory of general relativity. Massive objects modifying the geometry of space and time in their neighborhood. The light on it always takes the shortest route, but in a curved space modified by the presence of a huge mass, the shortest path is not straight. The light path is curved in the vicinity of massive stars. Most images of galaxies that are on this photography are multiple images of a single ring galaxy. A giant cluster of galaxies located in front, acts as a huge gravitational lens. Galaxies of this cluster appear in yellow and the observed galaxy appears in blue. A gravitational lens can create several images of background galaxies.	The singular form of the galaxy blue background (center) has allowed astronomers to deduce that it is reproduced on this image to 4 hours, 10 hours, 11 hours and 12 hours of the cluster center. The analysis showed that at least 33 images of 11 different galaxies background are discernible here. This spectacular photo of the galaxy cluster CL0024 1654 was taken by the Hubble Space Telescope in November 2004. Predicted by general relativity by Albert Einstein, gravitational mirages several have since been observed by the Hubble Space Telescope. Sometimes, when the alignment between two objects is perfect, the image of the distant object can be modified as to take the form of a luminous ring surrounding the object at hand. In case of perfect alignment between the source observed (a star for example), and another stellar object (a black hole for example), the black hole in front will act as a gravitational lens or deflector. The observer no longer sees the star as such but rather as a ring, this ring is called Einstein ring. A star, although a mass much lower than that of a galaxy can also act as a gravitational lens. The effect is obviously much less powerful, this is called gravitational micro lens.	This gravitational lens shows strange blue objects drawn dotting the image are multiple views of a single ring galaxy. The singular form of the galaxy blue background (center) has allowed astronomers to deduce that it is reproduced on this image to 4 hours, 10 hours, 11 hours and 12 hours of the cluster center.

© copyright : Astronoo		Astronomy - January 11, 2009