They appear as dark circles on the sun's surface.

Ex. 6: The lifecycle of a star is determined by its mass. A typical star will follow the main sequence, become a yellow star like the Sun, and die as a Red Giant and then settle as a White Dwarf. A black hole is an area that has had gravity pull in on itself due to a supermassive explosion. Black holes need large stars to form. The Milky Way was formed in the aftermath of the Big Bang, and is around at the super dense core. There are billions of Galaxies spread out through the universe.

Ex. 7: The Big Bang Theory is a theory that states that the universe began with a super massive and dense collection of matter that contracted into itself, and then, in a matter of moments, exploded in an endless expansion into space. All matter, as...
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