Answer:
Before this development, Pluto was considered one of the nine planets in our solar system.
Step-by-step explanation:
Plato says so...It's correct
Like most scientific concepts, that of gravitational waves emerged over many ... The implications of this discovery for the understanding of gravity were not lost on ... theory's fully developed equations proved that true gravitational waves could ... Einstein's skepticism largely impeded research in the field until after his death.
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