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the Halley's comet does not have atmosphere
A comet has no atmosphere.
Comets do not have atmospheres in the same way that planets do. Instead, they have a thin envelope of gas and dust, called a coma, that forms as the comet gets closer to the Sun and begins to heat up. This coma can extend hundreds of thousands of kilometers from the comet's nucleus.
comet
Yes, a comet experiences intense heating and friction as it enters Earth's atmosphere, causing it to burn and create a bright streak of light known as a meteor or shooting star. This process is due to the extreme speed at which the comet is traveling through the atmosphere.
The nebulous halo around the nucleus of the comet is called the "Coma" ...The stream of dust and gas that extends away from the comet is called the"Tail".
About the size of Texas.
The meteor is in the atmosphere and is only visible for seconds to minutes. The comet is much further away outside the atmosphere and can be observed for weeks to many months.
A Comet is a body in perpetual orbit. A Meteorite is a body which enters the Earth's atmosphere. It is unlikely that Halley's Comet will ever crash into the Earth.
The coma of a comet is formed due to melting of the comet's nucleus by the Sun's energy. This creates a cloud of gas and dust that surrounds the nucleus and forms the visible atmosphere of the comet.
A meteor or comet
I assume you mean "Meteor" and "Meteorites"