Answer:
The Earth rotates about an imaginary axis that passes two different poles. ... So, the equator experience more angular speed that tries to pull off the part of the Earth from the rotational axis. Hence the equator of the Earth is wider and bulge. The rotation of the Earth about its own axis affects the shape of the Earth.
Astronomers use redshirts to track the rotation of our galaxies, tease out the subtle tug of a distant plant on its parent star, and measure the expansion rate of universe.
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