Do Now On the back of the notes, write down three things that you know about the universe.

Describe the topography of this area.

Where would you recommend a spaceship land? 0o 41‘15“N 23o26’E July 20, 1969 Sea of Tranquility

Is space exploration important (it is very costly)? Why?

Aim: How did the universe form? Topic: Unit 8 Astronomy Main Idea: The Universe

1) The Big Bang Theory All matter was concentrated into a small area which then exploded outward and expanded rapidly 13.7 billion years ago.

The size is still expanding rapidly in all directions Evidence: Cosmic Microwave Background Radiation (CMBR) and Redshift

2) Doppler Effect As distance increases, waves stretch out; as they get closer they squeeze together.

3) Redshift/ Blueshift The change in color of a star toward the red end of the spectrum because it’s moving away or toward the blue if it’s approaching.

Red/Blue Shift

Early images of the Hubble Telescope 1994

4) Define galaxy: A collection of billions of stars and other material. 2014

Which is bigger: solar system, universe or galaxy? Universe (biggest), galaxy is in the universe and the solar system is in the galaxy.

5) Where is our solar system in the Milky Way galaxy? In our galaxy our solar system is located at the end of one spiral arm. (Interesting fact) It takes us 200 million years to rotate around the center of the galaxy

Summary: Answer the three questions at the bottom of the notes.