UNIT 15 - READING 1 Halley's Comet
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Reading Expert 4(2020)
Reading Expert 4(2020)
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UNIT 15 - READING 1 Halley's Comet
In November l835, a baby was born while a comet lit up the sky. The baby grew up to be the great writer Mark Twain. In 1909 he said, "I came in with the comet in 1835." "It is coming again next year, and I expect to go out with it." And he did! Mark Twain died the day after the comet reappeared in 1910. The comet was Halley's Comet, one of the most famous objects in our solar system. Astronomers believe that there may be as many as one trillion comets traveling through the universe. But only a few thousand of these have actually been observed. People have been noticing Halley's Comet since 240 BC. It looks like a star with a glowing tail moving across the sky. For a very long time, many people believed it to be a terrible sign of bad luck. But, in 1705, an English astronomer named Edmund G. Halley changed their minds. In his book, he said that comets observed in 1531, 1607 and 1682, were actually one comet making return trips every 76 years. He also predicted that the comet would come again in 1758. Unfortunately, Halley didn't live to see it. But when the comet appeared in 1758, his theory was proven and the comet was named after him. Halley's Comet is a very large ball of frozen dust and gas. We cannot usually see it as it travels across the solar system. However, about every 76 years, it passes near the Sun, the heat of which causes some of the frozen dust and gas to melt and burn away. The burning dust and gas reflect the Sun's light, appearing as the comet's famous tail. This is the only time we can see Halley's Comet move dramatically across the night sky.
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