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29.4 Asteroids, Comets, and Meteoroids

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Katelynn Dorn

on 1 May 2015

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Transcript of 29.4 Asteroids, Comets, and Meteoroids

29.4 Asteroids, Comets, and Meteoroids
Solar System Review
Asteroids
minor planets (>50,000)
orbiting rock fragments
Ceres= 1000 km
asteroid belt- between Mars & Jupiter
composition= carbon, iron & nickel, silicate
not quite able to form planets because Jupiter's gravity is too strong?
Earth-grazers and Trojan asteroids (past Jupiter)
Comets
body of rock, dust, methane, ammonia, and ice
core is rock, metal, ice (1-100 km)
coma- cloud of gas and dust (reflects sunlight)
tail- electrically-charged particles from sun push gas and dust away from head and away from sun
originated from the Oort cloud
long-period and short-period comets
Halley's comet appears every 76 years
Meteoroids
smaller bits of rock or metal (1 mm- 1 cm)
meteor- if they burn up in atmosphere before reaching earth; vaporize very quickly into a fireball
meteor shower- several visible every minute
Meteorites
meteorite- meteoroid that hits earth
Meteor Crater (Az)
1.3 km long crater, 180 m deep, 25 tons of iron and nickel fragments
3 Types:
stony- carbon, rock-like
iron- metallic
stony-iron- very rare
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