When the Earth was formed, it was made from
a huge cloud of gas and debris circling the sun.
All planets formed out of this spinning disk.
You can think of it like a whirlpool with the sun
at the center. As the planets formed, they kept
spinning around the sun, but their momentum like
tops kept them spinning in place too. That's why
the Earth rotates on its axis how it does. Since
all planets orbit the sun in the same direction,
and almost all planets rotate in the same
direction on their axes, scientists believe this
was the same direction the gas cloud was spinning
around the sun when planets formed.
There are two exceptions to this. Venus
spins the wrong way, and Uranus spins on its
side. In 2005, the best explanation for this
was discovered. Scientists now think the early
solar system was a crazy place with planets and
comets running into each other. These collisions
disturbed the spins of Venus and Uranus. But the
rest of the planets still spin and orbit the same
direction as that cloud of gas billions of years
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