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Light and Atmospheres

Light and Atmospheres. Greenhouse gases absorb infrared light Scattering of visible wavelengths depends on wavelength Molecular dissociation by ultraviolet light Ionization by X-rays. Atmospheric Layers. Greenhouse Effect. Blue Sky: Scattered Light. UV and X-ray Light.

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Light and Atmospheres

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  1. Light and Atmospheres • Greenhouse gases absorb infrared light • Scattering of visible wavelengths depends on wavelength • Molecular dissociation by ultraviolet light • Ionization by X-rays

  2. Atmospheric Layers

  3. Greenhouse Effect

  4. Blue Sky: Scattered Light

  5. UV and X-ray Light • Ozone (O3) in stratosphere of Earth absorbs ultraviolet light. • Chemical balance between O3 and O2 • Chlorofluorocarbons (CFCs) destroy ozone • X-rays ionize the upper layers of the atmosphere (ionosphere) • Charged particles reflect low frequency radio waves (e.g., AM radio)

  6. Atmospheric Windows • Certain wavelengths require orbiting telescopes • Radio and visible light can be done from ground

  7. Seeing: Atmospheric Effect

  8. Why Put a Telescope in Orbit? • The only reason to put a telescope in space is to eliminate atmosphere! • a) ground-based b) damaged Hubblec) enhanced image d) repaired Hubble

  9. Mauna Kea

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