1. Astronomy Radiation from Space

2. Electromagnetic spectrum Radiation – energy that is transmitted from one place to another by waves. - it has both magnetic and electric properties - carry energy through vacuum and matter Spectrum – an array

5. Infrared radiation

6. Parts of a wave: crest – top of wave trough – bottom of wave

7. Wavelength Larger wl – slower wave travels Less dangerous Smaller wl – faster wave travels More energy Moredangerous ww.pbslearningmedia.org/r esource/phy03.sci.phys.ene rgy.nasaspectrum/the- electromagnetic-spectrum- nasa/

8. Frequency of a wave

9. Wave frequency-number of waves per second.

11. Important waves on EMS. Radio waves – longest wave Microwaves Infrared waves – heat Visible light – ROYGBIV, (wl from larger to smaller) Ultra violet light – damages tissue causes skin cancer X-rays – absorbed by bones Gamma waves – radiation - very powerful - can cause radiation poisoning - used in radiation for cancer - kills body cells

12. Telescopes Refracting – convex lens (curved outward () ) light is bend by the lens and a focal point is produced. - The eyepiece magnifies the image. – Two lenses used to bend the light

13. Refraction - is the bending of light as it passes from one medium to another with different densities. Refraction of a pencil in water. Light waves are bent as the pencil enters the water.

14. Each transparent substance bends the light at different angles.

15. Reflecting – uses lens that is concave ) like a bowl. - light bounces to a mirror that focuses image. - mirror reflects image to eyepiece where it is magnified. 2 mirrors and concave lens

16. In reflection, a light ray strikes a smooth surface and bounces off. A reflected ray always comes off the surface of a material at an angle equal to the angle at which the incoming ray hit the surface.

17. Wavelength of color is reflected from the surface to the eye.

18. observatory

19. Hubble Space Telescope Launched 1990 Located outside of earth’s atmosphere Atmosphere distorts images Produces clearer images

20. Radio telescopes Collects radio waves from space Useful in any weather 24 hours a day Dish collects waves and focuses them on a receiver Receiver transforms the waves into electrical impulses or computer impulses

21. VLA The Very Large Array in New Mexico 27 moveable dishes Operate as one telescope Most powerful radio telescope NOTE: Contact Youtube pt 1 and 3