The Earth is always being drawn toward the sun by
gravity. With no gravity, the Earth would simply
coast off into space, since you need force to
change something's direction when it's moving. The
Earth doesn't fall into the sun simply because
it's moving too fast, and the sun's gravity isn't
strong enough to make the Earth come any closer,
only keep it at the same distance. This means the
Earth goes around the sun, keeping roughly the
same distance from the sun at all times - in other
words, its orbit.
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