Only the ephemeral non-massive particles such as light particles (photons), gravity particles (gravitons), and strong force particles (gluons) can actually travel at the speed of light.
A massless particle is a particle whose invariant mass is zero. Currently, the only known massless particles are gauge bosons: the photon (carrier of electromagnetism) and the gluon (carrier of the strong force). However, gluons are never observed as free particles, since they are confined within hadrons.
Neutrinos were, until recently, thought to be massless; but, because neutrinos change flavour as they travel, at least two of them must have mass.
The meaning of these prepositional phrases has evolved over time. Do you know the original "object" of the preposition? I'll PLANT a hint for the next question in each question the way I've PLANTED a hint for my first question in this sentence.
When we think of sports, we think of people or animals moving or doing things. This quiz, though, is about those non-breathing items without which games cannot be played, the inanimate items.
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