1. Origin of the Universe Bell work: Pick up handouts
Cut “Origin” one out around solid lines.
Grab your spiral

2. What is the universe?
Space and all the matter and energy in it
What energy form do scientists study to learn about the universe?
Electromagnetic radiation from visible light

3. What large scale structures make up the universe?
Star cluster – stars held together by gravity
Smallest
Galaxy cluster –
Lots of galaxies
Largest
Galaxy – million to billion stars
- 3 types
Super cluster-
Hundreds of galaxies
Solar System

4. Current Theory of Origin
Big Bang Theory
Our universe is thought to have begun as an infinitesimally small, infinitely hot, infinitely dense, something
After its initial appearance, it apparently inflated (the "Big Bang"), expanded and cooled, going from very, very small and very, very hot, to the size and temperature of our current universe.
It continues to expand and cool to this day

5. Evidence supports the Big Bang Theory
1.Light Element Abundance
Study stars
Look at spectral lines emitted by elements in stars
Compare element % to those present at Big Bang
Hydrogen most abundant

6. Evidence supports the Big Bang Theory
2. Red shift
Discovered by Edwin Hubble
Galaxies move away
Far away = fast moving
Shift of a wavelength
Doppler effect
Light in a wavelength stretches out when moving away to the red spectrum

7. Evidence supports the Big Bang Theory
3. Cosmic Wave Background
Thermal radiation left over from the time of the recombination of the Big Bang cosmology

8. Age of the universe? Estimated using expansion
Measure on how fast galaxies move away from Earth
Look at spectral data
Red shifts
Current data = expansion
Estimate age = 13 to 15 billion years old

9. Open Your Textbook to Page 326
Follow along as we fill in important contributions made by the following 5 scientists.
When finished. You can glue, staple, or tape both of today’s note taking items into your spiral.