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Comets  Loose collections of ice, dust, and small rocky particles  Orbits are usually very long, narrow eclipses  When orbit come close to Sun, it.

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Presentation on theme: "Comets  Loose collections of ice, dust, and small rocky particles  Orbits are usually very long, narrow eclipses  When orbit come close to Sun, it."— Presentation transcript:

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2 Comets  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

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

4 Where 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

5 Kuiper Belt

6 Oort Cloud  Jan Oort  Hypothesized cloud in 1950

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

8 Halley’s Comet  76 years

9 Halley’s Comet

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

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

12 The 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

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

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

15 Asteroid Belt  Where the majority of asteroids are found

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

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18 Why are there so many craters 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

19 Impact Craters  Eye of QuibecBarringer Crater (AZ)  200 million years old50,000 years old

20 Lunar Craters


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