William Herschel thought he had found a comet when he spotted the green disk of: Group of answer choices Triton. Uranus. Oberon.
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Actually it's 
and it says that the energy of an object (E) is equal to the mass (m) of the object multiplied with the squared speed of light (
). This theory says that mass can be turned into energy and energy can be turned into mass. This is one of Einstein's theory of relativity.