luminosity

The annual Perseid meteor shower requires us to leave behind our light-polluted cities for darker night skies that allow us to see the full luminosity of the celestial attraction.

The discovery was made possible by the European Space Agency's Gaia spacecraft, which is mapping more than a billion stars throughout the Milky Way and beyond, tracking their motion, luminosity, temperature, and composition.

The lower luminosities of red dwarf stars also means their habitable zones -- the range of orbital distances where liquid water could exist on a planet's surface -- lie closer to them.

A quasar's extreme luminosity has been obvious since astronomers first discovered the objects in the 1960s.

Lamps cannot be directed towards the upper hemisphere, and the law regulates their luminosity and color spectrum.