Hello, as above really. What causes the sun to move through space and also how did we work out it does?
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Strictly speaking, everything is moving. Motionlessness is impossible, because there’s no objective motionless state. Stopping completely is just as impossible as breaking the speed of light.
More to the point, though; the Sun is moving because the gas cloud it was formed from was moving in (roughly) the same direction, and it keeps moving because there’s nothing to stop it or slow it down. The only real force is the pull of the gravity of the Milky Way, continually pulling it in orbit around the core.
Everything in space moves. There is no such thing as a completely fixed point, and everything is moving relative to everything else. There wasn’t anything that caused the sun to start moving. The matter that makes up the Sun was moving before it became the Sun.
It is orbiting a supermassive black hole at the center of our galaxy. So the reason it moves is gravity, essentially.
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