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Comets, Meteors, and Asteroids

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Comets, Meteors, and Asteroids Structure of a Comet To Sun Ion Tail Dust Tail Coma Comet Structure Nucleus 10 km Dirty Snowball Coma Cloud of evaporated ices ... – PowerPoint PPT presentation

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Title: Comets, Meteors, and Asteroids


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
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
Sporadic Meteors
22
Barringers 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
(No Transcript)
32
Sedna
33
End of Section
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