Explore: Positronium.

Positronium (Ps) is a system consisting of an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium. Unlike

Positronium hydride, or hydrogen positride is an exotic molecule consisting of a hydrogen atom bound to an exotic atom of positronium (that is a combination

contains one or more exotic atoms. Di-positronium, two bound positronium atoms Positronium hydride, a positronium atom bound to a hydrogen atom "Exotic

example, the radius of positronium is approximately ⁠ 2 a 0 {\displaystyle 2\,a_{0}} ⁠, since the reduced mass of the positronium system is half the electron

Antimatter comet – Hypothetical object Di-positronium – Exotic molecule consisting of two atoms of positronium Gravitational interaction of antimatter –

positron in positronium can also have identical or parallel spin orientations, which results in an experimentally-distinct form of positronium with a spin 1

Di-positronium, or dipositronium, is an exotic molecule consisting of two atoms of positronium. It was predicted to exist in 1946 by John Archibald Wheeler

other particles to form various composite particles such as atoms and positronium, while neutrinos rarely interact with anything, and are consequently

it induces oscillations between positronium and mirror positronium. Positronium could then turn into mirror positronium and then decay into mirror photons

Examples of such atoms include positronium (e−  e+ ), muonium (e−  μ+ ), and "true muonium" (μ−  μ+ ). Of these positronium and muonium have been experimentally