AA 100 Lecture Notes - Lecture 2: Hubble Ultra-Deep Field, Telescopium, Observable Universe

• School: CSU
• Department: Astronomy
• Course: AA 100
• Professor: Hardegree- Ullman, Emily E

Document Summary

Lecture notes chapter 2 (the sky and its motions) In the hubble ultra deep field photo, there are over 10,000 galaxies with a galaxy that is 13. 2 billion light years away. Blue galaxies are ones that have stars forming, and red galaxies are ones that have old stars. An object with light spikes is a star in our own galaxy. There are about 10^22 stars in the observable universe and 100 billion in the. The amount of stars in the observable universe is about the same amount as all the dry grains of sand on all the beaches of the world. Astronomy is measured in powers of 10 (orders of magnitude) with 1 being the height of an average human, 10^20 the diameter of the universe, 10^25 the size of the universe, and 10^-5 the size of a virus. Constellation: area in the sky that has particular borders, pattern of stars.