Gravitational Lensing.
Crazy Facts Of Cosmology.
A gravitational lens is a distribution of matter between a distant light source and an observer, when astronomers refers to lensing, they are talking about an effect called gravitational lensing.
The light will be bent by the gravitational field around the galaxy . This is called "Gravitational Lensing".
In a system where lensing occurs there is a:
Source: -where the light comes from, can be a quasar, the cosmic microwave background, a galaxy, etc.
Lens: -which deflect(s) the light by an amount related to its quantity of mass/energy, can be anything with mass/energy.
Observer: -who sees a different amount of light than otherwise because the lens has bent spacetime and thus the travel paths of the light.
Image Or Image: -what the observer sees.
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