Carleton University, October 10, 2019
Where did all the planets come from? ...From the process of gravitational accretion....
Asteroid Itokawa 535 meters
Radiant of Shower
We see more meteors after midnight than during the early evening…. Dawn Why? Earth Sunlight Dusk
Buzzard Coulee Meteorite Saskatchewan November 20, 2008
50 - 100 tonnes/day
Hoba Meteorite, Namibia
Agnighto Meteorite, Greenland
Jon Larsen “In Search of Stardust”
1979 Sean Connery Henry Fonda Natalie Wood Karl Malden Martin Landau
Are we in danger from a major impact? Or even multiple impacts?
Typical path of comet
Comet Swift-Tuttle, photographed in 1992
Comet Shoemaker-Levy 9 : 1994 Eugene Shoemaker David Levy
Comet Shoemaker-Levy 9 The “String of Pearls”
30 meters in diameter
370 meters in diameter
Diameter Airburst Average Airburst Altitude Energy Frequency (meters) 30 m 530 kt 16 km (53,000 ft) 185 years 50 m 2.9 Mt 8.5 km (28,000 ft) 764 years 1,900 70 m 8.5 Mt 3.4 km (11,000 ft) years 3,300 85 m 15.6 Mt 0.4 km (1,430ft) years
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