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The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... All massless particles travel at the speed of light, but the differing energies of photons... [+] translates into different wavelength sizes. The energy of a single photon from the cosmic microwave background contains more energy than all of the Hawking radiation emitted by a black hole over the span of a second for any realistic black hole in our Universe. ... "
" ... All massless particles travel at the speed of light, including the photon, gluon and gravitational... [+] waves, which carry the electromagnetic, strong nuclear and gravitational interactions, respectively. We can treat every quantum of energy as discrete, but whether we can do the same for space and/or time itself is unknown. ... "
" ... Given the equation for gravity between two masses, and the fact that photons are massless, how is it possible for a mass (like a star or a black hole) to exert influence on said photon? ... "
" ... Of course, there was another wild possibility that — if correct — would alter our picture of the Universe from what the Standard Model predicted. The wild possibility is this: that the three types of neutrinos that we have are actually massive, rather than massless, and that they can mix together, just like the different types of quarks (with the same quantum numbers) can mix together. ... "
" ... One of the most fundamental rules of physics, undisputed since Einstein first laid it out in 1905, is that no information-carrying signal of any type can travel through the Universe faster than the speed of light. Particles, either massive or massless, are required for transmitting information from one location to another, and those particles are mandated to travel either below (for massive) or at (for massless) the speed of light, as governed by the rules of relativity. ... "