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AST101H1 Full Course Notes
AST101H1 Full Course Notes
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Lecture 1: the solar system is huge and the vast majority of it is empty, tiny quantities of gas and dust fill the space. 1 astronomical unit is the average distance between earth and the sun = 1. 5 x. 1 light year = 9. 46 x 10^12 km = distance light travels in one year. 1 au = 8 light minutes: the milky way galaxy is our galaxy as seen from earth, the andromeda galaxy is 2. 5 million ly away, largest galaxies to milky way. If light moved at infinite speed, you"d see everything in the universe as it is now. The sun is a fairly typical star: planets are large bodies which orbits stars. Large galaxies, like the milky way, contain about 100 billion stars, all orbiting a common center of gravity: the stuff in the universe is not static. Lunar eclipses can occur only at full moon, solar eclipses can occur only at new moon.

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