What is the definition of Established Light Particles?

"Established light particles" are like the cosmic unicorns of the particle world - they're the bright, shining, and utterly harmless stars that light up our universe. Think of them as the celestial equivalent of a friendly neighborhood kid, always around, never causing any ripples or drama.

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But here's an edgy example sentence to spice things up: "The physicist's latest theory predicted the existence of established light particles that would suddenly turn into invisible shadows, leaving behind a trail of bewildered astrophysicists and a universe in complete darkness."