1997 Apparition of Comet Hale-Bopp Observing Comet Hale-Bopp
Comet
-
Upload
kishan-vamja -
Category
Education
-
view
677 -
download
6
description
Transcript of Comet
COMETSPrepared By:- Kishan V
WHAT ARE COMETS?
F
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.
COMET TAIL
W
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.
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
TAILED-STAR
I
f we see from the earth we see the tail is seen
with the comet so it is know as a Tailed-star.
I
n fact it is not a star and its tail is not
permanent.
HALLEY’S COMETF
ar from orbits of more than750 comets are know.
T
he most famous comet is Halley’s comet.
I
t visits our solar family every 76 years.
I
t was last seen in 1996.
A
nd it will be again seen in 2062
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.
HALLEY’S COMET ROTATION
COMPOSITION OF COMETI
ces• H2O, Carbon Monoxide (CO), Methanol(CH3OH), and other frozen materials
Minerals• Silicate minerals
C
omplex organic molecules and dust particles• C=Carbon• H=Hydrogen• O=Oxygen• N=Nitrogen
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.
THANK YOU