AST201H1 Study Guide - Midterm Guide: Redshift
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AST201H1 Full Course Notes
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Universe: the sum total of all energy and matter. Totality of all space, time, energy and matter. Age & size of universe: 13. 7 billion years old. What we can see in the universe is called the observable. The horizon is the limit to what you can see no matter where you are. Light year: distance light travels in one year. The speed of light is c=300 million meters/second (in a vacuum) Contents of the universe: planets, dwarf planets, stars, galaxies etc. Our location in universe: milky way galaxy, neighbour galaxy. Weight: mass = amount of matter in an object, weight = force that acts upon an object. Newton"s laws of motion: an object moves at a constant velocity unless a net force acts to change its speed/direction, force = mass x acceleration, for every force, there is always an equal + opposite reaction force.