ASTR 102 Chapter Notes - Chapter 1: Milky Way, Big Bang, Red Dwarf
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ASTR 102 Full Course Notes
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Astr 102 review question sheet - chapter 1. These practice problems are designed to complement the lectures and textbook readings, solidifying your understanding of the concepts presented in this class. It will benefit you to think about the questions thoroughly, so make your best effort to solve them before checking your solutions. A light year is defined as the distance travelled by a photon (a particle of light) in a year, if it travels through empty space. Light travels at about 300 million meters per second through vacuum, so one light second would be 300 million meters. The moon is about one and a quarter light seconds away, and the sun is 8 light minutes away. Far away galaxies are moving further away from us. This is because the space between distant galaxies is expanding. As mentioned in the answer to question 1), light from the sun takes 8 minutes to get to us.
