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Halley's Comet

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narjis hemani

on 27 September 2013

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Transcript of Halley's Comet

A comet follows a regluar orbit like the planets, some comet's orbits goes beyond the drawf planet Pluto.'
Amazing Facts
In ancient times seeing a comet was considered as a bad omen or a curse from God .
A comet loses some of its gas and dust every time it passes by the sun
70-80%of the comet made of gas and water and 20-30% of chunks of metal and rocky meterial
Many scientist believe that the collision of comets on the Earth's surface brought a large amount of water that we have today.

As a comet approaches the sun, it warms up. During this warming, you can see the different parts
nucleus--main solid part made of maily rock
coma- is a halo of evapourated gases,water vapour
tail-the dust particals are blown backwards by the solar wind causing it to form a tail.Thats why the tail is seen only when it is near the sun
Tale behind the Tail
What is a comet?
A comet is a big ball of ice and rocks that orbits the sun
Where do they come from?
They are leftovers from the beginning of the solar system.
A comet is made up of rock, dust ,frozen gases and ice---looks like-A DIRTY SNOW BALL
There are many comets discovered in the Solar System and the most famous is
Halley's Comet!

Path of a comet

Halley’s Comet is the only comet to be visible to the human eye. It was named after the famous astronomer Edmund Halley, who calculated its orbit in 1682. The comet itself had been seen for many centuries prior to Halley’s calculations, but had not been recognized as a periodic comet. Halley’s Comet last appeared in 1986 and will re-appear sometime in 2061.
Halley's Comet
Halley's comet appears every 75 years.
Halley's comet appears every 75-76 years
It is darker than caol and reflects only 4% of the sunlight
It is shaped like a peanut
It is 15 km long and 8 km wide and thick,its diameter is 14km
When it is near the sun its closer than venus and when its far away from the sun its farther than Pluto.
By Narjis
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