Halley’s comet is probably the most famous comet. Historians say it was first noted about 2200years ago. The visit of the bright and strange space object has been observed and recorded every 76 years since then. This comet was named after British scientist Edmund Halley for he found its running regulation first.
Halley’s comet completed its latest trip around the earth in 1986. Now it is speeding toward the far-distant edges of our solar system.
More than 50 years ago, an American expert thought comets could be described as dirty snowballs. Pictures and information sent to the earth from the spacecraft have proved this theory. But they were also surprised at the size of the Haley’s comet icy center. It is about 15 kilometers long and 8 to 10 kilometers wide. Furthermore, the comet’s solid center is not smooth and round, but looks like a potato, as experts thought it would be after orbiting the solar system for millions of year.
Pictures of the comet’s center gave scientists another surprise. The center appears to be extremely black . Some of them said the comet’s center is the darkest you can image. This dark covering seems to be made of very small dust particles contain carbon and simple matter.
When it is close to the sun, it will spread a long tail because of the heat of the sun, which make it look nice.
Do you have telescope? Have you strong interest after reading this passage?
要通顺的,不通顺不给分
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