The Limb of the Sun
18,218Also, why do some flames look hollow? Thanks to http://www.audible.com/minutephysics for sponsoring this video.
More information about:
Limb darkening – https://en.wikipedia.org/wiki/Limb_darkening
Optical Depth – https://en.wikipedia.org/wiki/Optical_depth
Limb darkening – http://spiff.rit.edu/classes/phys440/lectures/limb/limb.html
Limb darkening and exoplanets – http://zuserver2.star.ucl.ac.uk/~idh/NewGrids/vLimb.pdf
Measuring the solar radius using limb darkening! – http://arxiv.org/pdf/1302.3469.pdf
Halo nebulas - http://blogs.discovermagazine.com/badastronomy/2010/12/16/a-delicately-violent-celestial-shell-game/
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