The reason why planets, such as Earth orbit
around the sun is because of the pull of the
sun's gravity. And the reason why it travels
around the sun is due to Earth's velocity which
is in the direction perpendicular to the force of
the sun's pull. If we didn't have a sun, the
Earth would just travel in a straight line.
Imagine if superman were to throw a football with
all his strength, it would keep going straight
across the Earth which circles the Earth and will
eventually hit him, that is basically what we are
doing to the sun, we are the football and the
earth's velocity is superman's strength. And the
strength is hard enough so that gravity doesn't
pull the football down to the ground. I am not
sure, but I think the reason why we rotate is due
to the Earth being at some certain angle.
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