3. WHAT ARE ASTERIODS?
• ASTERIODE ARE
SOLID PIECES OF
ROCK AND METAL
THAT ORBITS MAINLY
BETWEEN THE SUN
AND JUPITER.
4. WHAT DO THEY LOOK LIKE?
• Asteroids are very
irregular in shape.
• They are quite similar to
small planets or moon
like phobos (a natural
satellite of mars).
• Unlike comets, they do
not have cloud of
diffuse light around
them.
5. TYPES OF ASTERIODS
• M are believed to be
metallic.
• C are thought to be
carbonaecous.
• S contain more
silicates.
11. a feW Definitions
• MeteoroiD: THEY ARE SMALL PART OF
ROCK & METAL THAT ARE FLYING AROUND
THE SOLAR SYSTEM.
• Meteor: WHEN METEOROID ENTERS THE
EARTH ATMOSPHERE THEN IT IS SAID TO
BE METEOR.
• Meteorite: WHEN METEOR STRIKES THE
EARTH SURFACE THEN IT IS SAID TO BE
METEORITE.
13. iron Meteorites
• These are very dense
and made almost
entirely of iron.
• They show a pattern
of crystallization that
indicates a VERY
SLOW cooling rate.
15. haVe they hit us Before?
• Most meteoroids
disintegrate before
reaching the earth by
burning up in Earth’s
atmosphere.
• Some leave tail that
lasts for several
minutes large one can
cause damage.
16. lonar , Maharashtra
• 52000 year ago.
• This lake was created
by 60 meter long & 2
millions tons of heavy
meteor.
• The average depth of
Lonar lake is 150m &
1.2km in diametere.
17. METEOR
• Sometimes called a
“Shooting Star”.
• When a meteorite
enters Earth’s
atmosphere, friction
causes them to burn
up, producing a
streak of light.
18. METEOR SHOWERS
There about one
dozen
meteor showers that
occur on regular
dates throughout the
year.
These showers are
caused by debris left
behind by a comet
that passes close to
orbit of our planet.
20. WHaT aRE cOMET?
• A comet is small
heavenly body and
consist of mainly dust,
ice & some small
gritty particle.
• Sometime called
“dirty snowballs”.
21. WHaT iS THE STRucTuRE Of
cOMET?
• Nucleus
– 10 km “Dirty Snowball”
• Coma
– Cloud of evaporated
ices and ions.
– may be 100,000 km in
diameter.
• Tail
– Always points away
from Sun
22. TYPES Of cOMET
Comets are classified as either short-period or
long- period comet:
Short Period: (such as Halley's seen in every
76 years) with periods from years to decades.
Long Period: (such as humason seen in every
75 thousand year) with period from centuries to
thousands of years.
23. WHERE dO cOMET cOME fROM?
OORT CLOUD KUIPER BELT
• Many ordinate in a region
called the Oort cloud.
which is located beyond
the orbit of the planet
Pluto.
• But most of comets come
from Oort cloud.
• Oort cloud consists
trillions of comet.
• Others originate in the
Kuiper Belt beyond the
orbit of Neptune.
• Kuiper belt is a source of
short life comets such as
halley.
• Kuiper belt consists of
billions of comet .
27. COMET MISSION BY E.S.A.
• ROSETTA 11 YEAR MISSION.
• LAUNCHED ON FOURTH
MARCH 2004.
• PASSES BY MARS, ASTEROID
STEINS AND LUTETIA-1.
• HIBERNATE FOR 31 MONTH .
• USES SOLAR ENERGY TO FLY.
• LANDED AT 10 NOVEMBER
2014 ON COMET 67-P.
• TO SEARCH ABOUT
PLATINIUM. IRON & GOLD
etc....
28. WHAT IS THE DIFFERENCE BETWEEN
ASTEROID, METEOROID & COMET?
• THEY ARE ACTUALLY SPACE WASTE or SPACE
DUST.
• THEY ARE VALUABLE AS WELL AS DANGEROUS
FOR US.
• ASTEROID : A HUGE PIECE OF METAL IN SPACE.
• METEORIDE : THEY ARE LIKE A ROCK IN SPACE,
THEY ARE THE PART OF ASTEROIDS.
• COMET : A ENORMOUS PIECE OF ICE IN SPACE.