EARTHSC 2GG3 Lecture Notes - Lecture 13: Thermosphere, Ocean Current, Milion
16 Jun 2016
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Document Summary
The universe was created in an explosion known as the big bang 14 billion years ago: explosion produced the atomic particles that later formed galaxies, stars, and planets. First stars probably formed 13 billion years ago: the life span of a star depends on its mass. Large stars burn up more quickly ~ 100,000 years. Smaller stars, like the sun ~10 billion years: a supernova signals the death of a star. A supernova triggered the formation of the sun 5 billion years ago: the sun grew grew by accretion of matter from a flattened rotating disk of hydrogen and helium dust called a solar nebula. Asteroid: 10m - 1000km in diameter, consist of rock, metallic material, or mixtures of the two, most are located in an asteroid belt between mars and jupiter. Meteoroid: smaller pieces of asteroids that range from dust to objects a few meters across. Particles in the solar system are grouped according to their size and composition.
