building a comet! (an excuse to play with dry ice.)
TRANSCRIPT
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Building a Comet!
(An excuse to play with dry ice.)
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What’s the difference betweena comet and an asteroid?
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Comets are “beautiful objects.”
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“Ooooooooooh”
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“Aaaaaaaaaaaaaah”
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Asteroids are kind of ugly.
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...and sometimes they hate us.
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(Best movie EVER.)
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-Chunks of rock that orbit the sun between Mars and Jupiter
-Most are small pebbles; a few are larger than New Mexico
-Can be seen as meteors, or “shooting stars”
Asteroids:
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NEWS FLASHASTEROID TO HIT EARTH IN 2022!
An asteroid was discovered that's on a near-collision course with the Earth - and could crash into us in 2022.Astronomers have been monitoring the path of the giant space rock since it was spotted on January 28, 2000.
http://www.thehollywoodgossip.com/2013/03/cosmic-crash-2022-asteroid-to-go-boom/
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Meteorite impact in Russia, February 2013
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Shoemaker Levy 9meets Jupiter
July 1994
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Crater chain on Callisto
(One of Jupiter’s moons.)
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Energy from impacts...
- Speeds of ~65,000mph
- Meteorite the size of a football field → 1000 atomic bombs
- Dinosaur-killing meteorite: ~6 miles wide
- A little bigger means a LOT more energy 10 times bigger → 500-1000 times more energy
Side note: velocity = SQRT(2 * 9.8 m/s2 * height)
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Comets:
-Dirty snowballs (rock and ice)
-Long-period comets from the Oort cloud
-Short-period comets from the Kuiper Belt
-100,000 km in diameter with really long tails (2500 x Earth’s circumference)
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Diagram of a Comet
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Making a Comet!
- Make craters in flour
- ½ cup of water- 1 or 2 spoons of sand -- stir well- a little ammonia and a little organic material- crushed dry ice stir “vigorously” when adding the dry ice (but don’t tear the plastic bag)- a little more water – shape your comet
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