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When light scatters off light, a photon can briefly turn into a pair of particles, such as an electron and a positron. These interact and annihilate, turning back into a photon. But if heavier virtual ...
Scientists at the Relativistic Heavy Ion Collider have observed particles emerging directly from empty ...
About 80% of the universe's mass is thought to consist of dark matter. Yet, little is known about the composition and structure of the particles that make up dark matter, presenting physicists with ...
When fundamental particles are heavier or lighter than expected, physicists' understanding of the universe can tip into the ...
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The particles that are in an atom: protons, neutrons and electrons The particles that are in protons and neutrons: quarks The four fundamental forces: gravity, electromagnetism, the strong force and ...