In a recent post we demonstrated using the Newton’s cannon thought experiment that:
ISS and other satellites are always falling, but they are falling in Orbit
And this applies to planetary bodies too: Earth is always trying to fall into the sun, but it keeps falling in an orbit instead
But where did the initial velocity for the earth come from ?
Well, to answer that question one needs to go back 4.6 Billion years ago and look at the formation of the solar system.
And if you like numerical simulation and are wondering how could a spinning cloud of gas eventually form planets, take a look at the following video and its source paper.
Thanks for asking!