LIGHT

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Electromagnetic Spectrum

Lowest Energy

1. Radio wave

2. Microwave

3. Infrared

4. Visible Light

5. UV Radiation

6. X-Ray Radiation

7. Gamma Rays

Highest Energy

Shapes of the Universe - B/C GRAVITY

Planets orbit stars

Stars clumped together into galaxies

Galaxies ----> Galaxy Clusters

Galaxy Clusters------->Spongy structure of the Universe

Galaxies can be spiral or ellipitical

Color

Spectroscopy - measure light frequency....... -----------measure temperature of a body of something

Temp of Universe ---> Cosmic Microwave Background cooling off, doppler shift away

Doppler Shifts

Blue shift - toward observer - higher freq.

Red shift - away from observer - lower freq.

MEASUREMENT OF EXPANSION OF UNIVERSE

Hubble's Constant = Speed/Distance from Earth

---Universe is acceleration b/c red shift

Angular Momentum

Keeps planets rotating - smaller = rotate faster

Conservation of Energy - Quantized Light

measurement of the composition of the universe