ASTR 100 Chapter Notes - Chapter 1: Virgo Supercluster, Millisecond Pulsar, Interstellar Cloud

• School: University of Wisconsin-Stevens Point
• Department: Astronomy
• Course: ASTR 100
• Professor: Adrianna Durbala

Document Summary

Earth, solar system, milky way galaxy, local group of galaxies, local. The nearest star is proxima centauri and light from it takes 4. 4 years earth: andromeda galaxy takes 2. 5 million years g. The further away we look in distance, the further we look back in time i. 1 au = 1. 496 x 10^11 meters: the scale of the universe a. Is about one hundred thousand light years across: how big is the universe, one hundred billion galaxies, which is about 10^11 c, as many stars as every grain of sand on every beach on earth. The universe is 13. 7 billion years old a: cosmic calendar compresses fourteen years into one year. Chapter 1: our place in the universe c. The formation of the earth and the universe can be compressed into one calendar year, otherwise called the cosmic calendar scale i. The sun moves randomly while orbiting the galaxy c. d.