from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Not luminous.
He created the Bunsen burner for use in flame tests of various metals and salts: its nonluminous flame did not interfere with the colored flame given off by the test material.
Finally, near the center, something nonluminous appeared in the star field, and soon its seven-sided shape was fuzzily evident.
The four alien craft, still being tracked, were nonluminous dots, one in each quadrant of the screen.
The second misrepresentation runs thus: -- 'The developments of electricity and the formation of stars and suns, luminous and nonluminous, moons and planets, with their rings, &c., is deduced, very much according to the nebular theory of Laplace, from the principle propounded above.'
At such large distances, each of those clusters will likely appear as a single point of light, but O'Leary and Loeb suggest some distinguishing features that might aid in their identification, such as their high mass-to-light ratio, given the massive but nonluminous black hole at their center.