The UniverseAnswer
Can a Planet Orbit Two Stars?
Two stars can circle each other while a planet travels around them both. Astronomers confirmed it by watching the moving stars dim.
THE QUESTION LIBRARY THE UNIVERSE
Where does antimatter show up in everyday life?
Everyday examples reveal different ways to make and detect antiparticles.
THE SHORT ANSWER
Bananas can emit positrons through rare radioactive decay. PET scans use positron-emitting tracers and detect annihilation photons. Thunderstorms can produce particle pairs, while space instruments measure cosmic positrons. Observing these particles does not always identify exactly how they were made.
- A banana produces particles, not an antimatter fruit.
- PET detects light from positron–electron annihilation.
- A detected positron does not identify its source.
WHERE THE EVIDENCE STANDS
How sure are we?
- Potassium-40 has a positron-emitting branch.A rare route within its evaluated decay scheme.
- PET detects annihilation photons.Coincident photon pairs map the tracer.
- Thunderstorms can produce positrons.Reported annihilation signals support detected cases.
- Origins of cosmic positrons.Measured particle numbers and energies allow competing interpretations.
WHAT WE DON’T KNOW YET
The cited AMS analysis leaves source interpretations unresolved.
WHAT WOULD CHANGE THIS ANSWER
Origin models must explain the numbers and energies of measured particles and distinguish competing explanations.
Antimatter shows up as individual particles in familiar settings: in radioactive decay, in medical imaging, and in particles arriving from space. A common example is the positron, the electron’s antimatter partner, with the same mass and opposite electric charge.
THE LONG ANSWER
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Keep asking
Is antimatter real, or just science fiction?
Yes, antimatter is real.
New here?
God Plays Dice answers big questions in plain words, with sources and one of six honest labels.
Words worth knowing (2)
- Positron
- The electron’s antimatter partner.
- Pair production
- Energy producing a particle and its antiparticle.
Sources & further reading
(6)
- DOE Explains…Antimatter ↗U.S. Department of Energy; undatedPositrons and naturally occurring antimatter.
- Antimatter from bananas ↗Symmetry, Fermilab/SLAC; 23 July 2009Potassium-40 in bananas and positron annihilation.
- Potassium-40: Table de Radionucléides ↗LNE-LNHB/CEA evaluation; 19 July 2012, institutional mirrorRare positron-emitting decay branch.
- Nuclear Medicine ↗NIH NIBIB; reviewed September 2025PET tracers, paired photons and functional imaging.
- NASA’s Fermi Catches Thunderstorms Hurling Antimatter into Space ↗NASA; 10 January 2011, updated 13 March 2023Signals and proposed production.
- Towards Understanding the Origin of Cosmic-Ray Positrons ↗AMS Collaboration; analysis of 2011–2017 dataMeasured positrons and competing origin models.
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CONTINUE THE THREAD
Where this question leads.
The UniverseAnswer
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An everywhere-present field, a fleeting particle and a famous nickname. What did CERN’s experiments actually measure?
The UniverseAnswer
Why do physicists still call the matter-antimatter imbalance unsolved?
Why the matter surplus remains unexplained, what Sakharov's conditions require, and how sphalerons and proposed neutrino mechanisms might connect.