Distance indicators such as standard candles and standard rulers provide a direct route to mapping the expansion history of the Universe. By comparing observed fluxes or angular sizes of astrophysical ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Anyone interested in astronomy realizes that the stars are scattered through three-dimensional ...

A standard candle is an object whose luminosity, or brightness, is a known quantity. Standard candles are used by astronomers to estimate the distance of the candle itself, as well as nearby features, ...

The simple answer is that the intrinsic brightness of these variable stars is strongly tied to their period. This is the famous period-luminosity relationship discovered by Henrietta Leavitt more than ...

Later this decade, the Large Hadron Collider will be upgraded to the High-Luminosity LHC. What does “luminosity” mean in particle physics? Even on the hottest and driest days, rays from the sun are ...