The Limb of the Sun

Also, 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/ Link to Patreon supporters here: www.minutephysics.com/supporters.html Music by Nathaniel Schroeder, http://www.soundcloud.com/drschroeder MinutePhysics is on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich