Minor bodies
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Comets, meteors, and asteroids are objects that orbit the sun. A comet has three main parts - a icy nucleus, a coma of evaporated gases, and one or two tails that point away from the sun. The Oort cloud is a hypothesized spherical region at the outer edges of the solar system that is the source of long-period comets. Meteoroids enter the earth's atmosphere and burn up, creating meteor showers when the earth passes through their debris trails. Asteroids orbit the sun and range in size and composition, with some containing moons.
Minor bodies
- 1. Comets, Meteors, and Asteroids
- 2. Structure of a Comet To Sun Ion Tail Dust Tail Coma
- 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 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.
- 6. Comet Halley
- 7. Bayeaux Tapestry Norman Invasion of 1066
- 8. Comet Halley 1910 Pope Callixtus III excommunicated Halley's Comet in 1456 In 1910, charlatans sold "comet pills" Orbit
- 10. Comet of 1577
- 11. Hyakutake
- 12. Hale-Bopp
- 13. Comet West
- 14. The Cause of Meteor Showers P55/Tempel-Tuttle
- 15. Why After Midnight is Best Rotational Velocity Orbital Velocity Midnight
- 16. Shower Radiant
- 17. The 1833 storm
- 18. The 1966 storm
- 19. 1997 Leonids from Orbit
- 20. Two Showers for Halley
- 21. Sporadic Meteors Irons Stony-Irons Chondrites Carbonaceous Chondrite Achondrite
- 22. Barringers 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.
- 24. Tunguska, 1908
- 25. How Much Damage?
- 27. Ida - Dactyl
- 28. Gaspra
- 29. Kirkwood Gaps
- 32. Sedna
- 33. End of Section