Earth Sciences 1086F/G Lecture Notes - Lecture 12: S-Type Asteroid, Pyroxene, Aten Asteroid
15 Apr 2016
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Document Summary
Asteroids are primordial objects left over from the formation of the solar system. Evidence of meteorites tells us that the asteroids are the last remains of the planetismals that built the planets 4. 57 bya. Spacecrafts have photographed a few asteroids and revealed them to be mostly small, complex worlds with irregular shapes and heavily cratered surfaces. End of 18th century, group of 24 astronomers searched the sky for the missing planet" predicted at about 2. 8 au from the sun by titus-bode law. In rst few years, 4 asteroids discovered. Next wasn"t spotted until 38 years later, then more and more showed up. March 1998, new asteroid detective lincoln near earth asteroid research (linear) telescope was launched. As of 2011, linear has found over 231000 new objects; 2423 of these being rear- Estimated that btw 750,000 and 1. 7 million individual asteroids in the main asteroid.
