At the high end of the temperature range is the traditional incandescent filament used for lighting ... can be defined as the ratio of the total emitted luminous flux and the total supplied ...

Keck Observatory in Hawaii, researchers detected a very large, luminous nebula of gas extending ... We think this is part of a filament that may be even more extended than this, but we only ...

it forms an expanding bubble that can collide with the filament and send it over the edge to form a new star. The first luminous star is the first domino falling, setting off a chain reaction.