Their names are Phobos and Deimos. Next are the giant outer planets. They have lots of moons. Jupiter, for instance, has 79 known moons! The most well-known of Jupiter's moons are Io pronounced eye-oh , Europa, and Callisto. Jupiter also has the biggest moon in our solar system, Ganymede. These moons are so big you can see them with just a pair of binoculars. Saturn has 53 moons that have been named.
Saturn also has 29 moons awaiting confirmation. Asimov wrote another, similar, essay speculating what things might be like if the Sun had a smaller binary companion orbiting where Uranus is now.
He suggested the star could have an Earth-sized planet of its own which would be visible to the naked eye here. These planets are really close to the Sun. First of all, not THAT close, there are apparently much much closer situation in the galaxy that we have observed. Second, though the moons would have been in orbit of their planets, they would also have been in stable orbit around the sun.
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