This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to ...

The force between electrical charges is kind of a big deal—without it, the universe would be a primordial soup, and you would ...

Big G, known formally as Newton’s gravitational constant, describes the strength of gravity. But its precise value remains a mystery. Neil Webb ...

Early arrivals: the first four images of the gravitationally lensed supernova are shown in yellow. (Courtesy: NASA/ESA/JHU/UCLA/UC Berkeley/STScI) A study of how light from a distant supernova was ...

The Planck mission gave us the most precise value of the Hubble constant to date by measuring the cosmic microwave background. But studies made since using different methods provide different values.

An analysis of the jumps of a hydrogen atom’s electron has yielded a new, precise value for the Rydberg constant, a fundamental quantity in physics 1. The Rydberg constant is related to hydrogen ...

Debate over the universe’s expansion rate may unravel physics. Is it a crisis? Scientists tackle disagreements about the Hubble constant ...

A highly precise measurement of a physical constant known as the fine-structure constant provides a stringent test of the standard model of particle physics, and sets strong limits on the ...

Dark energy may not be a constant, after all, and only by looking to the Universe itself will we ever know for sure.

Dark energy might not be constant after all First results from the Dark Energy Spectroscopic Instrument offer hints of new physics.

In modern physics, the constant "c" plays a twofold role. On the one hand, "c" is the well known velocity of light in an empty Minkowskian space—time, on the other hand "c" is a characteristic number ...