EAPS 11600 Lecture Notes - Lecture 2: Edwin Hubble, Big Bang, Fusion Power
17 Jan 2019
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Document Summary
Cosmology-branch of astronomy/physics that focus on understanding the origin and evolution of the universe, from the big bang. Light year-the distance light travels in a year (5. 88 trillion miles) The speed of light is 186,000 miles per second. The nearest galaxy, andromeda, is 4. 2 light years away. Fusion happens when colliding particles combine to form a new, larger nucleus. Starting from hydrogen and helium in the big bang. Edwin hubble discovered that galaxies were moving away from earth (proposed the expanding universe) Expanding universe theory visualized with raisin-bread analogy a raisin-bread analogy for the expanding universe. As the dough expands, each raisin moves farther away from the others. Hubble"s expanding universe theory led to the idea that the universe may started at a specific point and time in the past. Astronomers have since concluding that this did occur, with the expansion beginning. 13. 8 billion years ago during a cataclysmic blast known as the big bang.
