ASTR 001 Lecture Notes - Lecture 1: Laniakea Supercluster, Moe Williams, Falsifiability
15 Jul 2020
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Document Summary
In a galaxy of 100 billion stars. Which is just one of billions of galaxies. In a universe that is 13. 7 billion years old. Moon"s diameter is about size of the continental u. s. Sun is about 1. 5 football fields away. Nearest star would be as far away as the length of the circumference of the earth. Milky way would fill the solar system out to saturn. Distance to andromeda would be 20 times the size of the solar system. Laniakea supercluster would stretch of the way to the nearest star. Light-year: distance light travels in one year. Light could travel around earth in 1/7 second light-> speed. 1 seconds to arrive from the moon. 8. 3 minutes to arrive from the sun. 4. 2 hours to get to neptune from the sun. 4. 2 years to arrive from the nearest star. 2. 5 million years to get to the nearest big galaxy. 10 billion years to come from distant galaxies.
