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The Nebular Hypothesis
The first indication that maybe we were onto something was in the mid 1700s, like the literal exact mid 1700s. Two people independently Laplace, a mathematician, and the philosopher Immanuel Kant came up with what today we call the nebular hypothesis. What they were imagining was that if you had a gas cloud, because there's gas all over the galaxy, how might that happen? So if a gas is kind of rarefied and thin, so you got to sort of collapse it so that it can become solid stuff.