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Comets & Asteroids
What they are
Where they are
They and us
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COMETS-WHAT THEY ARE
A huge ball of mostly
FROZEN
________ ________
WATER .
Their size ranges between
1 and ____
___
200 miles wide.
•There are
___________ in our solar system.
TRILLIONS
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COMETS-WHERE THEY ARE
OORT
Most comets are found in the ______
Cloud, which is about ________
75,000X further
out than the earth is from the sun.
A few orbit among the 8
__________
PLANETS .
A _________________
____ or
GRAVITATIONAL TUG
COLLISION
___________ is what sends some into
the inner solar system among the planets.
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COMETS-THEY AND US
A comet too close to the sun will begin
to die as it sheds small fragments due
to SOLAR
_______ _____
WIND passing over it.
TAIL forms.
This is how the _____
If the Earth later passes through this, a
METEOR
phenomenon we call _________
_________
SHOWER occurs.
There are ____
14 major meteor showers
that occur throughout the year.
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ASTEROIDS-WHAT THEY ARE
IRON ROCK
Asteroids are mostly _____
______.
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ASTEROIDS-WHAT THEY ARE
ORBIT the sun
Most asteroids harmlessly _______
between _______
MARS and _________.
JUPITER
They will never gather into a planet because
of Jupiter’s GRAVITY
_________.
A few have been nudged
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ASTEROIDS-THEY AND US
There are 10,000,000
___________ asteroids that cross
earth’s orbiting route that are at least 10 meters
across or larger.
A ____________
FOOTBALL _______
FIELD sized asteroid collides
with earth about every ______
1,000 years.
Asteroid ____
KT , some ____
6 miles wide, is thought
to be what caused the ____________
DINOSAUR extinction.
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