Comets, Meteors, and Asteroids - PowerPoint PPT Presentation

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Comets, Meteors, and Asteroids
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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 • Solar Wind and 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 (the furthest point away from the Sun) 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. Hyakutake

  12. Hale-Bopp (Spring 1997)

  13. Comet West

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

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

  16. Shower Radiant

  17. The 1833 storm

  18. The 1966 storm

  19. 1997 Leonids from Orbit

  20. Two Showers for Halley

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

  22. Barringer’s Crater Iron Meteorite 100 feet across and 70,000 tons Slammed into the Earth at about 43,000 mph Arizona desert near Flagstaff 40,000 years ago. Barringer Crater is 4,100 feet wide and 571 feet deep.

  23. Other Impact Craters

  24. Tunguska, 1908

  25. How Much Damage?

  26. Asteroids Apollo Trojans

  27. Ida - Dactyl

  28. Gaspra

  29. Kirkwood Gaps

  30. Asteroids Elsewhere

  31. Sedna

  32. End of Section