ERTH 2415 Lecture Notes - Lecture 13: Dwarf Planet, Space Debris, Meteoroid
14 Mar 2019
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Document Summary
Most meteoroids are asteroids or fragments from asteroids. Asteroid small rocky body orbiting the sun. During formation of solar system, small protoplanets didn"t stick together to form full planets. Asteroids from the main belt represent a low impact hazard some collisions between asteroids send fragments out of orbit rare near earth asteroids asteroids that cross earth or mars orbits. 1/1000 amount of asteroids as in main belt. Apollo and aten asteroids cross orbits high impact hazard sources of extraterrestrial debris secondary sources. Comet small object composed of ice and rock debris moving through outer space. Tiny fraction travel to the inner solar system. Most impactors are near earth asteroids or fragments of asteroids. Shooting stars melt in the atmosphere due to friction. Atmospheric entry associated with a fireball and loud sound o o. Impactor between 1 mmm and 100 m in diameter. Meteorites are the only source of extraterrestrial rocks and their formation processes.
