The speed at which a planet orbits around its parent star decreases as a function of the distance from that star, meaning that outer planets move much slower around a star than the inner planets. Stars orbiting a black hole however does not obey this law, remaining a constant between stars both close to the center and far away. Dark matter is theorized by some scientists to be matter which simply can’t be seen, and is referred to by them as “MACHO’s” which stands for “massive compact halo object...
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