September 12, 2013.
Lecture 2 – Where are we in the universe?
Learning Goals for this Section
State the full “cosmic address” of Earth
Correctly use the terms planet, dwarf planet, etc..
Our “Cosmic Address”
Earth < Sol System < Milky Way Galaxy < Local Group < Universe
o Our planet < Our solar system < Many solar systems orbiting a common centre <
A group of galaxies close to each other < EVERYTHING IN EXISTENCE
However big you imagine space to be, you are wrong
o Jupiter is about 10 times the size of Earth, the Sun is about 10 times the size of