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Which of these best describes the differences between the short-period and long-period comets?   a Short-period comets generally orbit the Sun in less than a century, whereas most long-period comets take thousands of years. b The short-period comets only move quickly when they're crossing the orbits of Jupiter or Mars, but the long-period comets move most quickly when they're near the Sun. c These terms only refer to how long ago the comet in question was discovered. d The short-period comets only spend a short time near the far points of their orbits, but the long-period comets spend most of their time there.

Which of these best describes the differences between the short-period and long-period comets?   a Short-period comets generally orbit the Sun in less than a century, whereas most long-period comets take thousands of years. b The short-period comets only move quickly when they're crossing the orbits of Jupiter or Mars, but the long-period comets move most quickly when they're near the Sun. c These terms only refer to how long ago the comet in question was discovered. d The short-period comets only spend a short time near the far points of their orbits, but the long-period comets spend most of their time there.

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Which of these best describes the differences between the short-period and long-period comets?
 
a Short-period comets generally orbit the Sun in less than a century, whereas most long-period comets take thousands of years.
b The short-period comets only move quickly when they're crossing the orbits of Jupiter or Mars, but the long-period comets move most quickly when they're near the Sun.
c These terms only refer to how long ago the comet in question was discovered.
d The short-period comets only spend a short time near the far points of their orbits, but the long-period comets spend most of their time there.
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