<p>I've read that photon's have zero mass, hence no force is needed to accelerate them. But then the second question. How can gravity affect something which has 0 mass?. Yes, gravity(black hole) can bend space and time but how can 0 mass particle be affected by this?. What am i missing.?</p>

CC BY-SA 3.0
2015-09-25T13:37:39.477Z
photons don't accelerate, they always travel at the speed of light
ProfRob
CC BY-SA 3.0
2015-09-25T18:15:10.640Z
There are many ways to explain this phenomenon, but the one I prefer is this one: http://astronomy.stackexchange.com/a/11911/1378
Florin Andrei
<gravity><black-hole><light>
How does light so travel so fast?.
NullReference
# How does light so travel so fast?.

(Asked by: username_0 on 2015-09-25)

I've read that photon's have zero mass, hence no force is needed to accelerate them. But then the second question. How can gravity affect something which has 0 mass?. Yes, gravity(black hole) can bend space and time but how can 0 mass particle be affected by this?. What am i missing.?

**Tags:** gravity, black-hole, light

> **Comments:**
> **username_1**: photons don't accelerate, they always travel at the speed of light  
> **username_2**: There are many ways to explain this phenomenon, but the one I prefer is this one: http://astronomy.stackexchange.com/a/11911/1378  

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