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At approximately 421,700 km (262,000 miles), the orbit radius of Io is slightly larger than that of the Moon. However, the distance between the surface of Io and the upper clouds of Jupiter is less than between the surfaces of Earth and the Moon, because of the much larger planetary radius of Jupiter.

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Is there any other planet similar to earth in the milky way?

No planets are similar but there is a moon. Titan, one of Jupiter's moons, is very similar to Earth.


Who observed that Jupiter's moons orbited Jupiter and not the earth?

Galileo


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Mercury is the planet with fewer moons than Jupiter. Mercury does not have any moons, while Jupiter has at least 79 known moons.


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No, Jupiter's moons do not have phases like Earth's moon. Phases are caused by the changing positions of the sun, Earth, and moon, but Jupiter's moons have no light of their own and do not reflect sunlight in the same way.


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How did Galileo's observations of Jupiter's moons challenge Ptolemy?

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How many moons are in the planet Jupiters?

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