Alien Eyes: Andromeda Galaxy Viewed Through the Electromagnetic Spectrum
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?Our human window on the Universe is terribly small within a stunningly small range of wavelengths. With our eyes we see wavelengths between 0.00004 and 0.00008 of a centimeter (where, not so oddly, the Sun and stars emit most of their energy). The human visual spectrum from violet to red is but one octave on an imaginary electromagnetic piano with a keyboard hundreds of kilometers long.?
James Kaler, astronomer and author of ?Heavens Gate: From Killer Stars to the Seeds of Life, How We are Connected to the Universe.?
Much of what you?ll� see in the European Space Agency video below is outside our human visual band; our eyes cannot register wave photons no matter how powerful they may be. Longer than the visual wavelength limit ? up to about a millimeter ? lies the infrared. �Longer waves, into kilometer-wavelengths toward the unknown end are what we call ?radio.? At the short end is violet, with orange, yellow, green, blue and hundreds of overlapping shades.
Shorter than the visual limit are the ultraviolet ? all running in the vacuum at the speed of light. At less than a percent of the wavelength of visual light are X rays, and at a factor of 100 smaller are the deadly gamma rays.
(via dailygalaxy)
Source: http://moderation.tumblr.com/post/5012270506
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