Midterm 2 study guide

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University of Toronto St. George
Astronomy & Astrophysics
Stefan Mochnacki

AST 201 Midterm Part 1 * The definition of Universe The universe is the totality of all space, time, energy, and matter. * The age and size of the Universe 13.7 billion year old; the universe has no outside * The observable Universe * Light travel time and the light year 1 light year almost 10 trillion km A light year is the distance light travels in one year. * The contents of the Universe Planet, star, solar system, galaxy, super cluster, * Our location in the Universe Earth, Solar System, Milky Way Galaxy, Local Group, Virgo Super cluster Summary from slides The Universe is the totality of everything The Universe is 13.7 billion years old, but we havent talked about why or how we know this We measure astronomical distances in light years A light year is almost ten trillion km Looking far away means looking back in time On Slides: Science is falsifiable. Part2 www.notesolution.com
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