A ribbon of some luminous material.
He saw that its entire body was enveloped in some luminous material.
He also conducted research on high frequency Schottky diodes, ferro-electric semiconductors, and luminous materials, and made important contributions to the field of electroluminescence.
They fled in a special store which sold nothing but Frubi-Kar, the indestructible luminous material.
As in all the rooms and flightways he had seen, the overhead was covered with a luminous material, probably a plant.
The same calculation today shows a smaller factor, based on greater values for the mass of luminous material; but it is still clear that the great majority of matter appears to be dark.
The luminous material wrapping the suspended tree root ball makes the sphere look like a mysterious globe.
Some rings were composed in whole or in part of luminous materials.
Some items made of luminous material were made into items to help in blackouts.
In the process, the universe allegedly generated 100 times more dark matter than luminous material.