Does light have a mass?

Question

Since light can't pull out of the gravitational force of a black hole, it should have a mass, but it can go through other masses as well, so that would confirm it's not a mass?

Answer 1

Light is made of particles called photons. These photons have a mass, butt it is VERY small.

So as gravity can do any force on photons it must be Very high.

Force=mass of photon * gravitational acceleration

Proof that light has mass is from gigantic stars and black holes.

These huge stars have extremely strong gravitational acceleration, so if light passes near them its path may bend.

Its the same case with black holes, but black holes are thought to have infinite gravitational acceleration, they are called black holes because they pull photons towards their center preventing them from reflecting and reaching our eyes to see them.

Answer 2

It is mass. Let me point you to a link

http://www.ted.com/index.php/talks/view/...

In that talk he mentions how sunlight has mass. I can't remember completely how (it's very advanced physics, and it's hard for me to understand it all) But I'm sure it does.

Answer 3

a photon has zero rest mass