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The Question
(Submitted February 28, 2003)
If light doesn't have a mass, how can it get sucked into a black hole?
The Answer
In a Black Hole, light traveling outwards towards an event horizon is pulled
back by the very strong gravitational field, because of the warping of
space-time inside the event horizon, regardless of the lack of a photon mass.
This prevents light from ever escaping the Black Hole.
This is also explained in one of our previous answers, "How Gravity
Affects Photons," at:
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/961102.html
-Kevin Boyce and Koji Mukai
for "Ask a High Energy Astronomer"
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