Do photons have mass or are they only energy?

[chound]

Do photons have mass or are they only energy?
And is it possible to convert energy to mass like mass is converted into energy in a nuclear reaction?
I read in Dan Brown's "Angels and Demons" that CERN has cre8d antimatter, but what exactly is it? Please answer in terms that a noob can understand!

 

[ZapperZ]

Please go to the Special and General Relativity forum and do a search on your topic. This has been addressed and answered numerous times.

Zz.

 

[Pengwuino]

cre8d?...

 

[simon009988]

Do photons have mass or are they only energy?
And is it possible to convert energy to mass like mass is converted into energy in a nuclear reaction?
I read in Dan Brown's "Angels and Demons" that CERN has cre8d antimatter, but what exactly is it? Please answer in terms that a noob can understand!

energy is converted to mass and the other way around via E=mc^2
antimatter is exactly like matter in every respect but if antimatter and matter meet they will annilate and release gamma ray photons

 

[Mk]

energy is converted to mass and the other way around via E=mc^2
antimatter is exactly like matter in every respect but if antimatter and matter meet they will annilate and release gamma ray photons

Antimatter particles have opposite charges, but equal masses as their normal-matter counter-parts. The two particles will only annihilate though, if their quantum numbers are equal.