The brightness scale that astronomers use has been around since ancient times. ... In it, the brightness difference of stars a single magnitude apart was roughly a ratio of 2.5.

Astronomers define star brightness in terms of apparent magnitude — how bright the star appears from Earth — and absolute magnitude — how bright the star appears at a standard distance of 32 ...

The antiquated brightness scale developed by the ancient Greeks is about to get a long-overdue upgrade that could help reveal the true nature of dark energy. Close. Advertisement.

The nitty-gritty. Nits are a measurement of brightness. When I measure a TV’s light output using a spectrophotometer and/or colorimeter (I personally use an X-Rite i1Publish Pro 2 and a Portrait ...

The latest information issued by NASA's Jet Propulsion Laboratory suggests that this comet could get as bright as magnitude -11.6 on the astronomers' brightness scale; that's as bright as nearly ...

The Comet Pan-STARRS, known officially as C/2011 L4 (PANSTARRS) will be readily visible with the unaided eye, though binoculars will be a help for spotting it against the twilight sky.