asteriods, meteors and comet
TRANSCRIPT
WHAT ARE asteriods?• ASTERIODE ARE
SOLID PIECES OF
ROCK AND METAL
THAT ORBITS MAINLY
BETWEEN THE SUN
AND JUPITER.
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.
TYPEs OF ASTERIODS• M are believed to be
metallic.
• C are thought to be
carbonaecous.
• S contain more
silicates.
WHERE ARE asteriods?• ASTERIODES ARE MAINLY
FOUND IN ASTERIOD BELT.
• ASTERIOD BELT IS
LOCATED BETWEEN ORBIT
OF MARS & JUPITER.
HAVE THEY HIT US BEFORE?
Many scientists
believe that asteroids
have hit the Earth
many times
in its history.
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.
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.
Stony-Iron Meteorites• These are rare and
contain both metal
and stone.
• They are mostly or
completely
shattered.
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.
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.
METEOR• Sometimes called a
“Shooting Star”.
• When a meteorite enters
Earth’s atmosphere,
friction causes them to
burn up, producing a
streak of light.
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.
What ARE comet?• A comet is small
heavenly body and
consist of mainly dust,
ice & some small
gritty particle.
• Sometime called
“dirty snowballs”.
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
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.
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 .
ARE COMETS DANGEROUS?COMET HITTING THE JUPITER.SHOEMAKER-LEVY-9(JULY 1998)
EFFECT OF SHOEMAKER-LEVY-9
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....
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.