I think that it is the Sun because everything in our solar system, which is the Milky Way, revolves around the Sun.
Mercury doesn't orbit Earth.
Mercury takes almost exactly 88 Earth days to orbit the Sun.
why do you need to know
Mercury
Mercury orbits the sun in 88 days because it is so close to the sun, 67,910000 KM from the it (to get the distance in miles divide it by 1.6 or .16 I forgot).
Mercury does not have any rings.
Mercury has no moons.
Mercury's orbit around the sun is approx 364 million km long.
Mercury doesn't orbit Earth.88 days
Mercury takes 87.969 days to orbit the sun.
Mercury
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Mercury.
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2008