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Comets, Meteors, and Asteroids

Comets, Meteors, and Asteroids. Structure of a Comet. Ion Tail. Dust Tail. Coma. To Sun. Comet Structure. 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 Due to Solar Wind & Radiation Pressure.

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Comets, Meteors, and Asteroids

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  1. Comets, Meteors, and Asteroids

  2. Structure of a Comet Ion Tail Dust Tail Coma To Sun

  3. Comet Structure • 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 • Due to Solar Wind & Radiation Pressure

  4. The Oort Cloud • In 1950 Jan Oort noticed that • no comet has been observed with an orbit that indicates that it came from interstellar space, • there is a strong tendency for aphelia of long period comet orbits to lie at a distance of about 50,000 AU, and • there is no preferential direction from which comets come.

  5. The Oort Cloud

  6. Comet Halley

  7. Bayeaux TapestryNorman Invasion of 1066

  8. Comet Halley 1910 • Pope Callixtus III excommunicated Halley's Comet in 1456 • In 1910, charlatans sold "comet pills" Orbit

  9. Comet Nucleus

  10. Comet of 1577

  11. Comet Pons-Encke, 1804

  12. Hyakutake

  13. Hale-Bopp

  14. Comet West

  15. The Cause of Meteor Showers P55/Tempel-Tuttle

  16. Midnight Rotational Velocity Orbital Velocity Why After Midnight is Best

  17. Shower Radiant The ‘leftovers’ of a comet. Apparent point of origin of a meteor shower.

  18. Shower Radiant

  19. The 1833 storm

  20. The 1966 storm

  21. 1997 Leonids from Orbit

  22. Two Showers for Halley

  23. Irons Stony-Irons Carbonaceous Chondrite Chondrites Achondrite Sporadic Meteors

  24. Barringer’s Crater An iron meteorite 100 feet across and 70,000 tons slamed into the Earth at about 43,000mph in the Arizona desert near Flagstaff 40,000 years ago. Barringer Crater is 4,100 feet wide and 571 feet deep.

  25. Other Impact Craters

  26. Tunguska, 1908

  27. How Much Damage?

  28. Asteroids Apollo Trojans

  29. Ida - Dactyl

  30. Gaspra

  31. Kirkwood Gaps

  32. Asteroids Elsewhere

  33. Sedna

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