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gravity.

The force of a large body (the sun) causes the smaller body (Earth) to be drawn toward the large body. However, other bodies (other stars) and collections of bodies (solar systems and galaxies) act in the same way but to a lesser degree on the same small body (Earth). This creates a sort of equilibrium that carries things to orbit.

Add all of this together and you get an orbit, which is usually (if not always) elliptical (squashed circle). gravity also causes the sun to have its own orbit. All of these gravitational forces cause the orbit to diminish: Earth will eventually crash into the sun (supposing it stays lit that long) and Pluto will eventually fly away into space.

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16y ago

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