Galaxies Information7

The observable building blocks of the universe are galaxies, which are each made up of a collection of stars, planets, gas, dust, and dark matter that is bound together by gravity. Hubble's observations help us understand how galaxies develop, expand, and change throughout time. Astronomer Edwin Hubble, who bears the name of Hubble, invented the concept of studying galaxies solely based on their outward appearance. He categorizes galaxies into three categories.
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