Gas and dust in a nebula is disturbed by an outside force
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Venus is the 2nd Planet in Our Solar System. Our Solar System is in The Solar Neighborhood. The Solar Neighborhood is in The Orion Arm. The Orion Arm is on The Milky Way Galaxy.
When Earth was created, it was sucked into the Sun's gravitational field like the other 7 planets. That is why it revolves around the Sun.
Moons are larger, obviously.
Friction, fission, fuel, fossil fuels are just a few science words that begin with the letter F.
A nebula, a large cloud of hydrogen gas, comes together under its gravity over a long period of time. One trigger may be perturbation from nearby supernovas.