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Saturn

Much like its neighbor Jupiter, the sixth planet from the sun has a rocky core and a gaseous surface. But Saturn is chiefly known for its intricate series of rings that encircle it. The mile-thick rings are made of countless orbiting ice particles, from less than an inch to several feet in size. Up close, it`s clear that Saturn has more rings than we can count. But though you can`t see all of them from Earth, you can spot three of them with a good telescope,. The two outermost rings are separated by a dark band called the Cassini Division, named for the astronomer who discovered it in 1675. The Cassini division isn`t empty, but it has less material in it. The middle ring is the brightest, and just inside it is a fuzzy one that can be difficult to spot. Saturn has 18 known satellites, made

Mostly of ice and rock. The largest, Titan, orbits Saturn every 16 days and is visible through a good-sized amateur telescope. Titan, which is larger than the planet Mercury, has a thick atmosphere that obscures its surface. Though researchers aren`t sure how many moons Saturn has, the total is likely at least 20, and may be much higher. When Galileo Galilei first studied Saturn in the early 1600s, he thought it was an object with three parts. Not knowing he was seeing a planet with rings, the stumped astronomer entered a small drawing – a symbol with one large circle and two smaller ones – in his notebook, as a noun in a sentence describing his discovery. Debate raged for more than 40 years about these “ears,” until Christiaan Huygens proposed that they were rings. Giovanni Domenico

Cassini later discovered a gap between the rings, which gained his name, and he also proposed that the rings were not solid objects, but rather made of small particles.


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