photons

E = hν
p = hν/c = h/λ

the photon is the quantum of the electromagnetic field; for instance, light. Photons have zero mass and zero electric charge, but they do carry energy, momentum and angular momentum. Photons are always moving, and photons in a vacuum always move at a constant speed with respect to all observers, regardless of the observers' own velocities. This speed is called the vacuum speed of light.

--- WIKIPEDIA: http://en.wikipedia.org/wiki/Photon

i love the existence of photons... those are today's spring photons. in my room.

光は波動と粒子でできている。質量をもたない粒子：フォトン。けど。ものすごいエネルギーと運動量をもつ。つねに光速で進行する。反射するか。透過する。このフォトンって存在が好き。すばらしい存在だと思う。