ScienceJuly 5, 2026
luminosity
/ˌluːməˈnɒsɪti/
Definition
The intrinsic brightness of an astronomical object, reflecting the total amount of energy it emits over a specific period.
Etymology
The word derives from the Latin 'luminosus,' meaning 'full of light,' based on the root 'lumen' (light). It entered English in the 17th century to describe the quality of emitting or reflecting light.
In the news
The article uses the concept of luminosity—specifically regarding bright satellites—to highlight how these artificial objects interfere with the observatory's ability to monitor faint, natural phenomena in the night sky.
The Rubin Observatory's 10-year movie of the universe is about to 'blow our minds,' chief scientist says
Read the full article ↗Live Science