the.com/photons
Light's loose change: massless packets that can't sit still and never grow old.
means The smallest possible units of light, tiny particles of energy that also behave like waves.
from From Greek phos, light, coined in 1926 by chemist Gilbert Lewis, though Einstein had described the idea two decades earlier without the snappy name.
No massMassless, yet they carry momentum and push sails.
Top speedAlways move at light speed, never slower.
No agingTime stops for photons, ageless from birth to absorption.
Sun delaySunlight's photons took 8 minutes to arrive.