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• s  having in itself the property of emitting light

• They know almost nothing about the smaller bodies in distant space which are not self-luminous, i.
• Astronomers deduced that the corona, though mostly scattered sunlight, was partly self-luminous.
• Then out of the darkness came "small, strangely shaped objects with self-luminous borders.

News & Articles

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• A global cloud map of the nearest known brown dwarf
  Brown dwarfs -- substellar bodies more massive than planets but not massive enough to initiate the sustained hydrogen fusion that powers self-luminous stars -- are born hot and slowly cool as they age. As they cool below about 2,300 K, liquid or crystalline particles composed of calcium aluminates, silicates and iron condense into atmospheric 'dust', which disappears at still cooler temperatures ...
  Feb. 3, 2014 - SpaceRef