Comets: Loose Collection of Ice, Dust, and Small Rocky Particles

This article explains what comets are, how they are formed, and where they are found. Comets are loose collections of ice, dust, and

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About Comets: Loose Collection of Ice, Dust, and Small Rocky Particles

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Slide1

Slide2Comets Loose collections of ice, dust, and small rocky particles  Orbits are usually very long, narrow eclipses  When orbit come close to Sun, it heats up, ice turns into gas, releasing dust

Slide3Structure of a Comet Coma – gas and dust that form an outer layer  Nucleus – inner layer of comet  Tail – can stretch for millions of kilometers

Slide4Where are comets found? Kuiper belt – disc-shaped region of icy objects  beyond the orbit of Neptune (billions of kilometers from our sun)  Oort Cloud – spherical cloud of comets  Spans 30 trillion kilometers from the sun

Slide5Kuiper Belt

Slide6Oort Cloud Jan Oort  Hypothesized cloud in 1950

Slide7Bayeux Tapestry Commemorates the Norman Conquest of England in 1066, depicts an apparition of Comet Halley .

Slide8Halley’s Comet 76 years

Slide9Halley’s Comet

Slide10Comet Shoe-Maker Levy 9 Short periodic comet  1993 collided with Jupiter

Slide11Meteoroid Come from comets or asteroids  Chunk of rock or dust in space Fun Fact: On average a meteor streaks overhead every 10 minutes!

Slide12The Life of a Meteoroid Comets or asteroids break to create a meteroid  Meteroid enters Earth’s atmosphere  meteor (burns up in the sky)  Meteroid passes through Earth’s atmosphere and hits Earth’s surface  meteorite

Slide13Meteor Showers October 20, 2011 – pieces of Halley’s comet

Slide14Asteroids Rocky objects revolving around the sun  Too small and numerous to be planets  Asteroid belt found between Mars and Jupiter Asteroid Ida

Slide15Asteroid Belt Where the majority of asteroids are found

Slide16Big Bang Theory 65 million years ago  Yucatan Pennisula, Mexico  Crater 200 kilometers in diameter

Slide17

Slide18Why are there so manycraters on the moon compared to the Earth?  Moon has no atmosphere  Earth’s atmosphere  wipes away evidence of craters (wind and water erosion, earthquakes)  Burns up meteors

Slide19Impact Craters Eye of Quibec Barringer Crater (AZ)  200 million years old 50,000 years old

Slide20Lunar Craters