Daffodil International University
Faculty of Science and Information Technology => Science and Information => Topic started by: kaushik.swe on July 23, 2014, 12:21:31 PM
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Gravitational lensing: Light around a massive object, such as a black hole, is bent, causing it to act as a lens for the things that lay behind it. Astronomers routinely use this method to study stars and galaxies behind massive objects.
Einstein's Cross, a quasar in the Pegasus constellation, is an excellent example of gravitational lensing. The quasar is about 8 billion light-years from Earth, and sits behind a galaxy that is 400 million light-years away. Four images of the quasar appear around the galaxy because the intense gravity of the galaxy bends the light coming from the quasar.
A picture has been uploaded named as "Einstein's cross" for an example. Photo Credit: NASA and European Space Agency (ESA)