A stunning new image from the NASA/ESA Hubble Space Telescope shows the effects of gravitational lensing caused by SDSS J0952+3434, a very massive group of galaxies located approximately 4 billion light-years away in the constellation Leo Minor.
Galaxy clusters contain thousands of galaxies of all ages, shapes and sizes.
Typically, 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.
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