Light: n.
the natural agent that stimulates sight and makes things visible

Figurative use of light as ‘a source of joy or delight’

1550 ‘sense of ‘mental illumination’

1590 ‘person eminent or conspicuous’

1680 ‘something used for igniting’

Dark: n.
the absence of light in a place; night

14c, figurative use as ‘sinfulness, wickedness’,
‘obscurity, secrecy, concealment, and blindness in physical, mental, or spiritual senses’

1590 ‘sullen, sad’

CITY

COSMOS

“Artificial light has long served as an indicator of modernity just as its converse—the urban blackout—has exposed the vulnerability of cities to infrastructure failure, wartime exigencies, or even social disorder.”

SPACE

n.
a large town; the major metropolitan center of a region

n.
the portion or extent of this in a given instance; extent or room in three dimensions

“On a clear night in 1994, an earthquake rumbled beneath Los Angeles and caused a city-wide power outage just before dawn. Startled awake, some residents who had stumbled outside called various emergency centers and a local observatory to report a mysterious cloud overhead.

That weird object turned out to be the band of the Milky Way, our home galaxy, which had long been obscured from view by the city’s lights.”