Changes

'''Gravitational lensing''' is a gravitational-optical effect whereby a background object like a distant [[quasar]] is magnified, distorted and brightened by a foreground [[galaxy|galaxies]]. An intervening concentration of [[matter]] is declared to bring 'focusing' effect attributed to [[general relativity]] so that even objects normally beyond [[Scientific observation|observational]] distance can be seen by [[astronomer]]s at the [[Earth]]. It is alleged that, for example, the [[galaxy cluster]] Abell 2218, distorts and magnifies light from galaxies behind it.<ref name="Samec">{{cite web

[[File:Einstein Rings (Cropped).jpg|thumbnail|300px|right|An image of gravitational lensing, compiled from images by [[NASA]] and ESA]] '''Gravitational lensing''' is a gravitational-optical effect whereby a background object like a distant [[quasar]] is magnified, distorted and brightened by a foreground [[galaxy|galaxies]]. An intervening concentration of [[matter]] is declared to bring 'focusing' effect attributed to [[general relativity]] so that even objects normally beyond [[Scientific observation|observational]] distance can be seen by [[astronomer]]s at the [[Earth]]. It is alleged that, for example, the [[galaxy cluster]] Abell 2218, distorts and magnifies light from galaxies behind it.<ref name="Samec">{{cite web

|title=No sign of gravitational lensing in the cosmic microwave background

|title=No sign of gravitational lensing in the cosmic microwave background

|author=Ron Samec

|author=Ron Samec

|publisher=Creation Ministries International  

|publisher=Creation Ministries International  

|url=http://creation.com/no-sign-of-gravitational-lensing-in-the-cosmic-microwave-background

|url=http://creation.com/no-sign-of-gravitational-lensing-in-the-cosmic-microwave-background

|accessdate=2012-10-25}}</ref>  

|accessdate=2012-10-25}}</ref>

 

==Gravitational lensing and Cosmic microwave background==

==Gravitational lensing and Cosmic microwave background==