What is the definition of Reached Light Particles?

"Reached light particles" is like saying something managed to cross the finish line in a race where the finish line was, of course, nothing but the brightest, shiniest light. It's like saying a cat reached its goal of purring at the top of a laser pointer - absurd, yet somehow totally plausible.

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Now, here's an edgy example sentence: "After a year of staring at the same data set, he finally reached light particles, proving that even in the darkest of scientific realms, there's always a glimmer of hope in the form of elusive photons."