
, Luminosity From Wikipedia , the free encyclopedia Jump to : navigation search This article is about the measurement of brightness . For the Cedar Point show , see Luminosity â Ignite the Night Image of galaxy NGC 4945 showing the huge luminosity of the central few star clusters , suggesting there are 10 to 100 supergiant stars in each of these , packed into regions just a few parsecs . across Luminosity is generally understood as a measurement of brightness Each discipline , however , defines the term differently , depending on what is being . measured Look up luminosity in Wiktionary , the free . dictionary In astronomy , luminosity measures the total amount of energy emitted by a star or other astronomical object in SI units of joules per second , which are watts A watt is one unit