1. Tools of Astronomy

2. Electromagnetic Radiation Light travels as an “Electromagnetic” Wave The light you see is called Visible Light Speed of light: 186,000 Miles/Second Spectrum: the different colors and wavelengths of light.

3. Electromagnetic Spectrum (Energy Spectrum) Infrared Ultraviolet _____________ visible light_____________ Long waves ROY G BIV Short waves (infrared wavelengths) (Visible) ( Ultraviolet Wavelength)

4. Spectroscope Splits light – into it’s “Colors” Identifies: 1. Elements that make up a Star 2. Star Temperature Prism: triangular piece of glass that splits up light.

5. Types of Telescopes Optical: gathers visible light Radio: gathers invisible energy Optical: use lenses and mirrors collects and focuses light.

6. Refracting Telescopes: Use lenses

7. Reflecting Telescopes: Use Mirrors Curved Mirrors Example: Hubble space telescope The largest telescopes are Reflecting

8. Hans Lippershey Invented the Telescope

9. Galileo First person to use a telescope to observe objects in the night sky.

10. Radio Telescopes Gathers invisible radio energy Collects and focuses energy