bn:00560690n
Noun Concept
EL
ολοκληρωμένη μέγεθος  ολοκληρωμένο μεγέθους  φωτεινότητα επιφάνειας
EN
In astronomy, surface brightness quantifies the apparent brightness or flux density per unit angular area of a spatially extended object such as a galaxy or nebula, or of the night sky background. Wikipedia
Relations
Sources