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Practice Speaking: Re-tell lecture
ID: #47343
Medium Saturn Rings
Transcript:
Saturn's rings are the most spectacular planetary ring. Consisting of countless particles whose diameters range from microns to meters, these rings orbit the Saturn in 1610, Galileo was the first man who spotted Saturn's rings. With his 20-power telescope, Galileo might have mistaken Saturn's gaseous ring to surmise that the Saturn system was formed of one planet with two moons as satellites. In 1675, Giovanni Cassini determined that Saturn's "ring" was actually composed of sub-rings with gaps among them. So the number of Saturn's rings are more than 10. Other planets like Venus, Jupiter, Neptune and Uranus also have rings but not as many as Saturn have. Finally, Scientists have dedicated themselves to study the formation of Saturn rings and claim that these rings are formed by gravitational fields.
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