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Stars above bryce2010



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  • Light Pollution. This is light we produce shining up to space. Why does this matter?
  • So here’s our bad light again. Replace it, or better yet, retrofit it…
  • So here’s our bad light again. Replace it, or better yet, retrofit it…
  • With a shade that comes all the way down to the bottom of the bulb, and the only light that come sout, goes to where it is needed. And better yet, get a shade with a reflective inner surface, and all the light that used to go to waste, now goes to useful purposes. The result, is that you get more light where you need it. In fact, since you now get more light than you originally have, you can replace your bulb with a lower wattage and thus save electicity, which saves energy, which saves you money. It is a win, win, win, win.
  • First, let’s take a look at your typical outdoor light fixture. We want outdoor lighting to make us safe. The light shining upward above the horizon, isn’t doing anything. It’s all waste. The light that shines horizontally is light that usually shines right into our eyes, it’s glare, and really isn’t doing much to keep us safe (in fact it can even hide the presence of something bad). The rest, the light shining down, that’s the productive light.
  • Here’s a bad light.
  • Here are some examples.
  • If you want information on how to install effective lighting, retrofit existing lighting, suggested manufactures of night-sky friendly lighting, check out the IDA. They can also help with information about light-pollution ordinaces.


  • 1. Stars Above, Earth Below Adventures of an Astronomer in the National Parks Dr. Tyler Nordgren
  • 2. Denali National Park Bryce Canyon National Park
  • 3. Arches National Park
  • 4. Chaco Culture National Historical Park
  • 5. Glacier National Park
  • 6. Bryce Canyon National Park
  • 7. Bryce Canyon National Park
  • 8. Bryce Canyon National Park
  • 9. Arches National Park
  • 10. Rocky Mountain National Park
  • 11. Acadia National Park
  • 12.  
  • 13.  
  • 14. Acadia National Park
  • 15. Acadia National Park
  • 16. Acadia National Park
  • 17. Acadia National Park
  • 18. Acadia National Park
  • 19. Hubble Space Telescope – M51
  • 20. Acadia National Park
  • 21. NASA New Horizons
  • 22. NASA/JPL Galileo
  • 23.  
  • 24. NASA/JPL Cassini
  • 25. NASA/JPL Cassini
  • 26. NASA/JPL Cassini
  • 27. Yellowstone National Park
  • 28.  
  • 29. Chaco Culture National Historical Park
  • 30. Chaco Culture National Historical Park
  • 31. Night on Earth – ESA/Rosetta Spacecraft
  • 32. Light Pollution
  • 33. Chad Moore/NPS
  • 34. Death Valley National Park – NPS Night Sky Team
  • 35. Joshua Tree National Park – NPS Night Sky Team
  • 36. Light Pollution
  • 37. Who Cares?
    • Loss of Natural Night affects biosphere:
      • Nocturnal species (raptors, turtles, etc)
      • Humans
    • Waste of electricity, money, resources.
  • 38. Arches National Park
  • 39. Light Pollution
  • 40. Light Pollution
  • 41. Direct Waste- 50% Glare- 10% Productive- 40%
  • 42.  
  • 43. McGraw Ranch – Rocky Mountain NP
  • 44. Lake Yellowstone Hotel – Yellowstone NP Lake McDonald Lodge – Glacier NP
  • 45. www.darksky.org
  • 46. Natural Bridges National Monument – NPS Night Sky Team
  • 47. Natural Bridges National Monument
  • 48. Yosemite National Park
  • 49.  
  • 50.  
  • 51. Thank you Available in Mach www.Planetary.org/Parks Stars Above, Earth Below On Sale Now