Antimatter

In modern physics, antimatter is defined as matter composed of the antiparticles of the corresponding particles in "ordinary" matter. Minuscule numbers of antiparticles are generated daily at particle accelerators—total artificial production has been only a few nanograms—and in natural processes like cosmic ray collisions and some types of radioactive decay, but only a tiny fraction of these have successfully been bound together in experiments to form antiatoms. No macroscopic amount of antimatter has ever been assembled due to the extreme cost and difficulty of production and handling. Theoretically, a particle and its antiparticle have the same mass, but opposite electric charge, and other differences in quantum numbers. A collision between any particle and its anti-particle partner leads to their mutual annihilation, giving rise to various proportions of intense photons, neutrinos, and sometimes less-massive particle–antiparticle pairs.

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Physicists invoke the cosmological collider to explain why matter, and not antimatter, dominates the universe

Are There Anti-Stars (Made of Antimatter) Around Us?

Physicists Search for Matter-Antimatter Asymmetry in Higgs Boson-Tau Lepton Interactions

Antiprotons in Superfluid: Hybrid Antimatter-Matter Atom Behaves in Unexpected Way

An Antimatter Experiment Shows Surprises Near Absolute Zero

Large Hadron Collider Reveals Secret of Antimatter Creation in Cosmic Collisions

Unexpected Behavior of Hybrid Matter–Antimatter Atoms in Superfluid Helium Surprises Physicists at CERN

A Hybrid Interstellar Mission Using Antimatter

Largest Matter-Antimatter Asymmetry Observed at Large Hadron Collider

Antimatter-driven Deceleration at Proxima Centauri

Small stellar corpse shoots antimatter beam trillions of miles into deep space

NASA caught a dead star spewing antimatter across space in dazzling new image

A Pulsar is Blasting out Jets of Matter and Antimatter

A Huge Beam of Antimatter Has Been Caught Streaming From This Runaway Pulsar

Chandra Spots Huge Filament of Matter and Antimatter from Gamma-Ray Pulsar

Tiny Star Unleashes Gargantuan Beam of Matter and Antimatter

This gleaming experiment may solve the cosmic mystery of antimatter

Matter and antimatter respond to gravity in the same way, study finds

Antimatter Responds to Gravity in Same Way as Regular Matter, New Experiments Suggest

Matter and antimatter seem to respond equally to gravity