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Refraction of light in the atmosphere!
WHY IS THE SKY BLUE?
THE ATMOSPHERE
http://www.visionlearning.com/library/module_viewer.php?mid=107
PARTICLE DENSITY
http://www.visionlearning.com/library/module_viewer.php?mid=107
LIGHT!!!
186,282 miles/sec
COLORS IN THAT LIGHT!
http://missionscience.nasa.gov/ems/09_visiblelight.html
SUNLIGHT
http://missionscience.nasa.gov/ems/09_visiblelight.html
• THE SUN'S CORONA
• The Sun is the dominant source for visible-light waves our eyes receive. The outer-most layer of the Sun's atmosphere, the corona, can be seen in visible light. But it is so faint it cannot not be seen except during a total solar eclipse because the bright photosphere overwhelms it. The photograph below was taken during a total eclipse of the Sun where the photosphere and chromosphere are almost completely blocked by the moon. The tapered patterns—coronal streamers—around the Sun are formed by the outward flow of plasma that is shaped by magnetic field lines extending millions of miles into space.
http://missionscience.nasa.gov/ems/09_visiblelight.html
SUN TEMPERATURE
http://missionscience.nasa.gov/ems/09_visiblelight.html
ABSORPTION• Gas molecules are smaller than the wavelength of visible light. If light bumps into them, it
acts differently. When light hits a gas molecule, some of it may get absorbed. After awhile, the molecule radiates (releases, or gives off) the light in a different direction. The color that is radiated is the same color that was absorbed. The different colors of light are affected differently. All of the colors can be absorbed. But the higher frequencies (blues) are absorbed more often than the lower frequencies (reds). This process is called Rayleigh scattering. (It is named after Lord John Rayleigh, an English physicist, who first described it in the 1870's.)
RAYLEIGH SCATTERING
PERCENT SCATTERED
AT THE HORIZON
SPACE VIEW OF SUN
RED AT NIGHT….
NORTHERN LIGHTS• http://www.youtube.com/watch?v=PaSFAbATPvk&feature=related
