1. Universe Mr. Skirbst Physical Science Topic 24

2. Watch Videos: VIDEO: The Universe CLIP: Understanding the Universe CLIP: Early Theories about the Universe CLIP: Matter & Energy

3. Universe Big Bang Theory - the belief that the universe began with an explosion from a single point containing all the matter of the present universe

4. Universe Big Bang Theory - states that the universe is currently expanding in all directions

5. Universe Doppler Effect - apparent change in wavelength due to the movement of an object http://astro.unl.edu/classaction/animations/lig ht/dopplershift.html

6. Doppler Effect Red Shift - spectrum shifted to red - indicates movement AWAY from an observer

7. Doppler Effect Blue Shift - spectrum shifted to blue - indicates movement TOWARD an observer

10. Features of the Universe Constellations - groups of stars that appear to form patterns in the sky

11. Features of the Universe Galaxies - major feature of the universe - huge collection of billions of stars

12. 3 Types of Galaxies 1. Spiral - shaped like a pinwheel You are here!

13. 3 Types of Galaxies 2. Elliptical - varies from spherical to disk-like

14. 3 Types of Galaxies 3. Irregular - no definite shape

15. Gravity - Force holding galaxies together - Matter “clumped” together by gravity

16. Calculating Gravity G = 4 pi 2 L / T 2 pi = 3.14 L =.5m T = 1.4 sec where: