Orion Glossary
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local superclusterThe supercluster of galaxies centred on the rich Virgo cluster of galaxies and including the Local Group as an outlying constituent. | |
luminosityThe amount of power emitted by a luminous object such as a star or galaxy, in the form of light or other electromagnetic radiation. It is related to the observed brightness of an object by the relationship: luminosity is proportional to brightness multiplied by distance squared. Luminosity may be measured in the unit of watts. | |