The story
They were first observed by astronomer Bart Bok in the 1940s.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A dark cloud of dense cosmic dust and gas in which star formation sometimes takes place. Full definition →
They were first observed by astronomer Bart Bok in the 1940s.
Etymology from Wiktionary, CC BY-SA 4.0.