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The four largest and best known of Jupiter's 60+ moons. I can see these through my telescope!!! ❤️

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Some of Jupiter's moons! There are 67 confirmed moons of Jupiter. This gives Jupiter the largest number of moons with reasonably secure orbits of any planet in the Solar System.

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Like the sun, Jupiter is composed predominantly of hydrogen & helium. But unlike the sun, it lacks the necessary amount to begin fusion, the process that fuels a star. Jupiter would need to be 75-80 times more massive than it is at present to be considered a star. If all of the planets in the solar system had formed as part of the gas giant, it still would not have sufficient mass. Still, by itself, Jupiter is 2 & 1/2 times larger than all of the other planets in the solar system combined.

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A cylindrical projection of Jupiter stitched together from photos taken by the Cassini spacecraft during its December 2000 flyby of the planet.

A cylindrical projection of Jupiter stitched together from photos taken by the Cassini spacecraft during its December 2000 flyby of the planet.

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Jupiter Moons - Callisto discovered by Galileo Galilei in 1610 using a telescope. It is thought to have oceans of liquid water beneath its crust. about the size of Mercury, is the 3rd largest moon in the solar system. It is more heavily cratered than any other moon in the solar system. Callisto remains as it was when it formed, during the period of intense meteoroid bombardment that the entire solar system experienced

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The Moon, Venus, Jupiter and Aldebaran making a square in the sky just before sunrise.

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