add the sentence that best establishes the topic of the paragraph. the leonids meteor shower gets its name…

add the sentence that best establishes the topic of the paragraph. the leonids meteor shower gets its name from the constellation leo, the lion, which is located near where the meteors appear to originate in the sky. each november, the meteor shower occurs as particles from the comet tempel - tuttle enter earths atmosphere, burning up and appearing as streaks of light. in a typical leonid shower, only about fifteen meteors appear per hour, one of the lowest rates of any major meteor shower. nonetheless, every thirty years or so, people can expect to be dazzled by a leonid \storm.\ in contrast to a meteor shower, a storm produces at least one thousand meteors every hour. a particularly breathtaking leonid storm took place in 1966, when thousands of meteors fell per minute as earth traveled through an unusually dense cloud of particles from tempel - tuttle. stargazers remarked that the streaks of the meteors resembled a giant waterfall. the leonids meteor shower gets its name from the constellation leo, the lion, which is located near where the meteors appear to originate in the sky. the leonids meteor shower is best viewed on a clear night, but increasing light pollution is making this cosmic event difficult to see. although astronomers cannot count the exact number of meteors that appear in a leonids meteor shower, they can make educated guesses. the meteor shower known as the leonids isnt the most active or powerful of the year but occasionally produces an astonishing display.

add the sentence that best establishes the topic of the paragraph. the leonids meteor shower gets its name from the constellation leo, the lion, which is located near where the meteors appear to originate in the sky. each november, the meteor shower occurs as particles from the comet tempel - tuttle enter earths atmosphere, burning up and appearing as streaks of light. in a typical leonid shower, only about fifteen meteors appear per hour, one of the lowest rates of any major meteor shower. nonetheless, every thirty years or so, people can expect to be dazzled by a leonid \storm.\ in contrast to a meteor shower, a storm produces at least one thousand meteors every hour. a particularly breathtaking leonid storm took place in 1966, when thousands of meteors fell per minute as earth traveled through an unusually dense cloud of particles from tempel - tuttle. stargazers remarked that the streaks of the meteors resembled a giant waterfall. the leonids meteor shower gets its name from the constellation leo, the lion, which is located near where the meteors appear to originate in the sky. the leonids meteor shower is best viewed on a clear night, but increasing light pollution is making this cosmic event difficult to see. although astronomers cannot count the exact number of meteors that appear in a leonids meteor shower, they can make educated guesses. the meteor shower known as the leonids isnt the most active or powerful of the year but occasionally produces an astonishing display.

Answer

Brief Explanations:

The paragraph discusses the Leonids meteor - shower, its origin, typical rate, and occasional spectacular 'storms'. The best topic - establishing sentence should summarize these aspects. The first option just gives the naming origin, the second focuses on viewing conditions, and the third on astronomers' estimations. The fourth option mentions that it's not the most active but can have astonishing displays, which encompasses the main points of the paragraph.

Answer:

The meteor shower known as the Leonids isn't the most active or powerful of the year but occasionally produces an astonishing display.