To save this word, you'll need to log in. Send us feedback. See more words from the same year Dictionary Entries near luminosity lumino- luminophor luminoscope luminosity luminosity curve luminous luminous efficiency.
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Luminosity , in astronomy , the amount of light emitted by an object in a unit of time. The luminosity of the Sun is 3. Astronomers usually refer to the luminosity of an object in terms of solar luminosities, with one solar luminosity being equal to the luminosity of the Sun. The most luminous stars emit several million solar luminosities. The most luminous supernovae shine with 10 17 solar luminosities. The dim brown dwarfs have luminosities a few millionths that of the Sun.