What are the dimensions of the universe and what would be the total area, mass and/or radius, etc of the whole universe combined?
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Earth is the fifth largest of the planets in the solar system. It's smaller than the four gas giants —Jupiter, Saturn, Uranus and Neptune — but larger than the three other rocky planets, Mercury, Mars and Venus.
Earth has a diameter of roughly 8,000 miles (13,000 kilometers) and is round because gravity pulls matter into a ball. But, it's not perfectly round. Earth is really an "oblate spheroid," because its spin causes it to be squashed at its poles and swollen at the equator.
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