Light will react to a gravitational field and change its direction (again, not really "accelerating" -- Einstein tells us this effect comes from the fact that space and time are not "flat" and the light rays just follow the shortest distance between two points, which may be curved). When a photon travels into a gravitational potential, it picks up energy and changes color, becoming "blueshifted". On the way out, it becomes "redshifted" as it loses energy. An observer will always see the photon traveling at the speed of light as it reaches him, however.http://www.youtube.com/watch?v=-y6OSkDH4nk&mode= related&search=http://www.youtube.com/watch?v=JKPVQal851 U&NR
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THE HOST
Three books of Occult philosophy, The burgalur in the Rye, the Golden Compass