Can a theory that isn’t completely testable still be useful to physics?
We already know neutrinos break the mold of the Standard Model. The question is: By how much?
When they look for violations of Einstein’s general relativity, physicists deliberately plan experiments to find nothing at all.
Theorists think dark matter was forged in the hot aftermath of the Big Bang.
Many theories predict the existence of magnetic monopoles, but experiments have yet to see them.
It’s the cornerstone of cosmology, but what is it all about?
The first website to be hosted in the US has grown to be an invaluable hub for open science.
From lightning to the death of electrons, the highest-energy form of light is everywhere.
A theory of everything would unite the four forces of nature, but is such a thing possible?
Quantum physics says everything is made of particles, but what does that actually mean?