AST101H1 Chapter Notes -Copernican Revolution, Nicolaus Copernicus, List Of Largest Galaxies
16 Nov 2012
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AST101H1 Full Course Notes
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3. 1/3. 2 the ancient roots of science/ ancient greek science. Our solar system is located a little more than half way from the galactic centre to the edge of the galactic disc. The milk way is one of the largest galaxies out of 40. Galaxy clusters: galaxies with a few dozen members. Superclusters: regions where galaxies and galaxy clusters are tightly packed (clusters of galaxy clusters) The universe is expanding, average distances b/w galaxies is expanding. 14 billion years ago expansion began (beginning of the big bang) Early universe had only hydrogen and helium, other elements were made by stars. Our solar system was made 4. 5 billion years ago. A star is born when gravity compresses the material in a cloud until the centre becomes hot enough to create energy by nuclear fusion. A star dies when it runs out of fuel, new stars born from leftover matter *recycling plants.
