# The mass of a photon

• I

Photons have mass? I didn't even know they were Catholic.
I was going to respond that photons are "massless" particles, but then I realized that photons have energy, and thus must have mass.

What's the proper explanation here?

berkeman
Mentor

I was going to respond that photons are "massless" particles, but then I realized that photons have energy, and thus must have mass.

What's the proper explanation here?

https://www.physicsforums.com/insights/?s=mass

Mister T