Exploring Space

1. Exploring Space

2. Radiation From Space • Electromagnetic Spectrum • Energy leaves a star in the form of radiation • Transmitted by electromagnetic waves • Waves arranged according to wavelengths

3. Speed of Light 300,000 km / sec. 186,000 mi / sec. In a vacuum (space)

6. Energy Waves • Crest – Top (highest point) of each wave • Trough – Bottom (lowest point) of a wave • Wavelength – Distance between successive wave crests (troughs) • Frequency – # of crests (troughs) that pass a point in 1 second • Amplitude – distance between a wave’s mid point and its crest (trough)

8. Energy Waves (cont.) • Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) _________ the wavelength = _________ frequency _________ the wavelength = _________ frequency

9. Energy Waves (cont.) • Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = _________ frequency _________ the wavelength = _________ frequency

10. Energy Waves (cont.) • Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = Higher frequency _________ the wavelength = _________ frequency

11. Energy Waves (cont.) • Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = Higher frequency The longer the wavelength = _________ frequency

12. Energy Waves (cont.) • Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = Higher frequency The longer the wavelength = Lower frequency

13. Light • Made up of all colors of the spectrum • Travels in a straight path • Slows down as it travels through different substances

14. R O Y G. B I V

15. RO YG.B I V

16. Light • Reflect – the bouncing of light off the surface of a material • Refract – the bending of light as it passes from one substance to another

17. Prism: angular piece of glass used to produce a spectrum.

18. Colors • White – all colors reflected • Black – all colors absorbed • You don’t “see” black • Sensation when very little light of any color reaches your eye • Green – green, blue, yellow reflected

19. Why do you see the colors that you see?

20. Why do you see the colors that you see?

21. Why do you see the colors that you see?

22. What happens when you wear a black shirt on a hot summer day? Why?

27. Rainbow Simulator

33. t

34. Telescope

35. Telescope (far.. seeing)

36. Telescope (far.. see) Radio Telescopes Optical Telescopes

37. Telescope (far.. see) Radio Telescopes collects and focuses radio waves Optical Telescopes

38. Telescope (far.. see) Radio Telescopes collects and focuses radio waves Optical Telescopes collects and focuses light rays

39. Telescope (far.. see) Radio Telescopes Optical Telescopes Refracting: uses a lens to bend light to a focal point Reflecting: uses a mirror to bounce light to a focal point

41. Focal Length focal point

42. Focal Length focal point Objective Lens

43. Focal Length Eyepiece focal point Objective Lens

44. Light rays from the eyepiece enter your eye before it crosses the focal plane, therefore the image is not corrected (re-inverted). Eyepiece Objective Lens

45. Focal Length Eyepiece Objective Lens F (objective) Magnification = F (eyepiece)

46. Focal Length Eyepiece Objective Lens 700 mm Magnification = 15 mm

47. Focal Length Eyepiece Objective Lens Magnification = 46.6 x

48. Focal Length Eyepiece Objective Lens 700 mm Magnification = 10 mm

49. Focal Length Eyepiece Objective Lens Magnification = 70 x

50. Focal Length Eyepiece Objective Lens 700 mm Magnification = 5 mm