2. Andromeda Galaxy – Galaxy closest to ours 2.5 Million light year away

3. Intro to astronomy youtube http://www.youtube.com/watch?v=D8zZZZ zppIMhttp://www.youtube.com/watch?v=D8zZZZ zppIM

4. Light year Distance Light travels in one year in a vacuum Equals 300,000 km/sec or 186,000 mi/sec A light year is about 6 trillion miles long

5. Crab nebula

9. Universe Current Theory of Origin Big Bang Universe started as an extremely dense single point and exploded outward Age - 10 – 16 Billion Years

11. Big Bang Evidence 1. Cosmic Background Radiation – Residual energy (or faint microwave radiation) found all over in space due to the cooling of the fireball

12. http://www.youtube.com/watch?v=Kg9F5p N5tlIhttp://www.youtube.com/watch?v=Kg9F5p N5tlI http://www.wwnorton.com/college/astrono my/21st-century-astro3/astrotours.aspxhttp://www.wwnorton.com/college/astrono my/21st-century-astro3/astrotours.aspx

13. Doppler Effect

14. Big Bang Evidence 2.Red shift of all galaxies Galaxies are moving away from us

16. Shifted toward the longer wavelength Shifted toward the red Galaxies are moving away, therefore universe is still expanding Wavelengths are longer Wavelengths are shorter

19. Doppler Effect

20. http://www.youtube.com/watch?v=Fhfnqbo acV0http://www.youtube.com/watch?v=Fhfnqbo acV0 http://www.youtube.com/watch?v=J43lAE SftPshttp://www.youtube.com/watch?v=J43lAE SftPs

21. http://www.youtube.com/watch?v=fgg2tpU VbXQ&feature=channelhttp://www.youtube.com/watch?v=fgg2tpU VbXQ&feature=channel