The story
A modern term used primarily by amateur astronomers.
Etymology from Wiktionary, CC BY-SA 4.0.
deep-sky
Today it means: Existing outside of the Solar System; relating to that which exists outside of the Solar System. Full definition →
Today it means: Existing outside of the Solar System; relating to that which exists outside of the Solar System. Full definition →
A modern term used primarily by amateur astronomers.
Etymology from Wiktionary, CC BY-SA 4.0.