Comets originate from the icy outer regions of the solar system like the Kuiper Belt and Oort Cloud. When gravitational forces perturb comets from their orbits, they fall toward the sun. As comets approach the sun, their icy material sublimates and forms an atmosphere around the solid nucleus and two distinct tails - an ion tail pointing directly away from the sun, and a dust tail lagging behind the comet's trajectory. The most famous comet is Halley's Comet, which returns every 76 years.

1. COMETS
Prepared By:- Kishan V

2. WHAT ARE COMETS?
ar From Pluto There is a group of about
millions of celestials objects. It is know
as cloud of Oort or Kuiper-belt . These
objects due to some reasons start moving
towards the sun. They are known as
comets. Comet are made up of dust and
icy rocks.

3. COMET TAIL
hen the comet starts moving towards
the sun the ice which is frozen around
the nucleus of the comet starts melting.
When the comet is near to the sun the
tail of it is longest and when it starts
moving far from the sun the tail becomes
shorter And last it vanishes.

5. TWO TYPES OF TAILS
 Ion tail: Ionized gas pushed
away from the comet by the
solar wind. Pointing
straight away from the sun.
Dust tail: Dust set free from
vaporizing ice in the comet;
carried away from the comet
by the sun’s radiation
pressure. Lagging behind the
comet along its trajectory

6. TAILED-STAR
f we see from the earth we see the tail is
seen with the comet so it is know as a
Tailed-star.
n fact it is not a star and its tail is not
permanent.

9. HALLEY’S COMET
ar from orbits of more than750 comets
are know.
he most famous comet is Halley’s comet.
t visits our solar family every 76 years.
t was last seen in 1996.

10. EDMOND HALLEY
 In 1704 Sir Edmond Halley found
that that comet and it was named
after Halley.
 In 1704 Sir Edmond Halley
hypothesized that the comets of
1456, 1532, 1607, 1682 were the same
object.
 He calculated a 75.7 year orbit and predicted
that it would return in 1758.
 Halley died; but comet returned.

11. HALLEY’S COMET
ROTATION

12. COMPOSITION OF COMET
ces
• H2O, Carbon Monoxide (CO), Methanol(CH3OH), and other
frozen materials
 Minerals
• Silicate minerals
omplex organic molecules and dust particles
• C=Carbon
• H=Hydrogen
• O=Oxygen
• N=Nitrogen

14. COMET AS BAD LUCK IN
OLD AGE
In ancient days arrival of the comet was
considered to be responsiblefor war, epidemic
or a natural calamity like flood.
But mordern science has proved that arrival
and departure of a comet is just a normal event
and there is no need to panic about it.

15. THANK YOU