Light and Atmospheres Greenhouse gases absorb infrared light Scattering of visible wavelengths depends on wavelength Molecular dissociation by ultraviolet.

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Presentation transcript:

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 Ozone (O 3 ) in stratosphere of Earth absorbs ultraviolet light. –Chemical balance between O 3 and O 2 –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)

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

Seeing: Atmospheric Effect

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

Mauna Kea

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