write a short note on comets.??????????????
Answers
Answer:
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Explanation:
Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun, it heats up and spews dust and gases into a giant glowing head larger than most planets. The dust and gases form a tail that stretches away from the Sun for millions of miles. There are likely billions of comets orbiting our Sun in the Kuiper Belt and even more distant Oort Cloud.The current number of known comets is: 3,611.
As theorized by astronomer Gerard Kuiper in 1951, a disc-like belt of icy bodies exists beyond Neptune, where a population of dark comets orbits the Sun in the realm of Pluto. These icy objects, occasionally pushed by gravity into orbits bringing them closer to the Sun, become the so-called short-period comets. Taking less than 200 years to orbit the Sun, in many cases their appearance is predictable because they have passed by before. Less predictable are long-period comets, many of which arrive from a region called the Oort Cloud about 100,000 astronomical units (that is, about 100,000 times the distance between Earth and the Sun) from the Sun. These Oort Cloud comets can take as long as 30 million years to complete one trip around the Sun.
Each comet has a tiny frozen part, called a nucleus, often no larger than a few kilometers across. The nucleus contains icy chunks, frozen gases with bits of embedded dust. A comet warms up as it nears the Sun and develops an atmosphere, or coma. The Sun's heat causes the comet's ices to change to gases so the coma gets larger. The coma may extend hundreds of thousands of kilometers. The pressure of sunlight and high-speed solar particles (solar wind) can blow the coma dust and gas away from the Sun, sometimes forming a long, bright tail. Comets actually have two tails―a dust tail and an ion (gas) tail.
Most comets travel a safe distance from the Sun―comet Halley comes no closer than 89 million kilometers (55 million miles). However, some comets, called sungrazers, crash straight into the Sun or get so close that they break up and evaporate.
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Comets:
Comets:Comets are the small bodies with a head and a long luminous tail. They are made up of dust and frozen gases. They appear in the sky after a long period. The comet known as Halley's comet, appears in the sky after every 76 years' interval.
Comets:Comets are the small bodies with a head and a long luminous tail. They are made up of dust and frozen gases. They appear in the sky after a long period. The comet known as Halley's comet, appears in the sky after every 76 years' interval.️⭐️The name comet means a 'hairy star's.
Comets:Comets are the small bodies with a head and a long luminous tail. They are made up of dust and frozen gases. They appear in the sky after a long period. The comet known as Halley's comet, appears in the sky after every 76 years' interval.️⭐️The name comet means a 'hairy star's.⭐️Comets are relatively small and icy celestial bodies revolving around the sun.
Comets:Comets are the small bodies with a head and a long luminous tail. They are made up of dust and frozen gases. They appear in the sky after a long period. The comet known as Halley's comet, appears in the sky after every 76 years' interval.️⭐️The name comet means a 'hairy star's.⭐️Comets are relatively small and icy celestial bodies revolving around the sun.⭐️They are visible only when they are near the sun.
Comets:Comets are the small bodies with a head and a long luminous tail. They are made up of dust and frozen gases. They appear in the sky after a long period. The comet known as Halley's comet, appears in the sky after every 76 years' interval.️⭐️The name comet means a 'hairy star's.⭐️Comets are relatively small and icy celestial bodies revolving around the sun.⭐️They are visible only when they are near the sun.Hope it helps.