雅思閱讀真題

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Saturn is the second largest planet. Only Jupiter is larger. Saturn has seven thin, flat rings around it. The rings consist of numerous narrow ringlets, which are made up of ice particles that travel around the planet. The gleaming rings make Saturn one of the most beautiful objects in the solar system. Jupiter, Neptune, and Uranus are the only other planets known to have rings. Their rings are much fainter than those around Saturn.

Saturns diameter at its equator is about 74,900 miles , almost 10 times that of Earth. The planet can be seen from Earth with the unaided eye, but its rings cannot. Saturn was the farthest planet from Earth that the ancient astronomers knew about. They named it for the Roman god of agriculture.

Saturn travels around the sun in an elliptical orbit. Its distance from the sun varies from about 941,070,000 miles at its farthest point to about 840,440,000 miles at its closest point. The planet takes about 10,759 Earth days, or about 29 1/2 Earth years, to go around the sun, compared with 365 days, or one year, for Earth.

Rotation

As Saturn travels around the sun, it spins on its axis, an imaginary line drawn through its center. Saturns axis is not perpendicular to the planets path around the sun. The axis tilts at an angle of about 27 degrees from the perpendicular position.

Saturn rotates faster than any other planet except Jupiter. Saturn spins around once in only 10 hours 39 minutes, compared to about 24 hours, or one day, for Earth. The rapid rotation of Saturn causes the planet to bulge at its equator and flatten at its poles. The planets diameter is 8,000 miles larger at the equator than between the poles.

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