Does Light Have Mass?

My question is on photons and the speed of light.As far as I am aware photons have momentum, and are affected by gravity, so my reasoning is they must have, in some sense, mass, though I am yet to find a straight answer on whether this is the case or not...If photons are not strictly massless particles, then could a hypothetical particle with less mass than a photon travel faster than the speed of light?If photons are massless particles, how can the "speed" of light be defined, and how does light travel/how is it propelled?
- Reuben Baverstock (age 21)
Beckley, East Sussex, England

This should answer your question:

https://van.physics.illinois.edu/qa/listing.php?id=16351.

Mike W.

(published on 07/07/2016)