2. Astronomy Chapter 21 page 583

3. Space Exploration Radiation from Space – the electromagnetic spectrum ( EM spectrum)

4. EM Spectrum

5. Visible Light ROYGBIV ( Wavelength = 300 – 720 nm) OR 3000 to 7200 Angstroms Red - Orange – Yellow – Green- IndigoViolet Blue – Indigo - Violet

6. Wavelength Wavelength is the distance from crest to crest. The SI unit is meters or nanometers (nm). Angstroms are another unit.

7. Claude Monet Impressionists painted the effects of light.

8. EM Spectrum Long Wavelengths Radio waves Microwaves Infrared ( Then Visible Light)

9. EM Spectrum SHORT Wavelengths Ultraviolet ( UV) X-rays Gamma rays

10. EM Radiation : From the SUN and all STARS All stars give off electromagnetic radiation ( x-rays, gamma, microwaves, etc.) Speed of Light = 300,000 km/second OR 186,000 mile/sec

11. How Fast is Light? Speed of sound = about 700 mi/hr Speed of sound is only 0.2 mi/sec Space shuttle flies at Mach 25 ( 17,500 mi/hr) This is only 5 miles /second…slow as compared to light!