What does "cosmic background" mean?

Ellipsis of cosmic background radiation.

Cosmic background

Common synonyms include: cmb radiation, cosmic afterglow, cosmic background radiation, galactic, space-related, universal.

noun

noun ·Rare ·Advanced level

Noun

1
Ellipsis of cosmic background radiation. abbreviation, alt-of, ellipsis, uncountable
"Her doctoral thesis concerned the origins of the cosmic background."

"Her doctoral thesis concerned the origins of the cosmic background."