by Galaxy clusters contain thousands of galaxies of all ages, shapes and sizes.
They have a mass of about one million billion times the mass of the Sun and form over billions of years as smaller groups of galaxies slowly come together.
Albert Einstein predicted in his theory of general relativity that massive objects will deform the fabric of space itself.
When light passes one of these objects, such as a huge galaxy cluster, its path is changed slightly.
Called gravitational lensing, this effect is only visible in rare cases and only world’s best telescopes can observe the related phenomena.
Hubble’s sensitivity and high resolution allow it to see faint and distant gravitational lenses that cannot be detected with ground-based telescopes whose images are blurred by the atmosphere of our planet.
Source
They have a mass of about one million billion times the mass of the Sun and form over billions of years as smaller groups of galaxies slowly come together.
Albert Einstein predicted in his theory of general relativity that massive objects will deform the fabric of space itself.
When light passes one of these objects, such as a huge galaxy cluster, its path is changed slightly.
Called gravitational lensing, this effect is only visible in rare cases and only world’s best telescopes can observe the related phenomena.
Hubble’s sensitivity and high resolution allow it to see faint and distant gravitational lenses that cannot be detected with ground-based telescopes whose images are blurred by the atmosphere of our planet.
Source
