The word for today is…
nebula (noun) –
1 : any of numerous clouds of gas or dust in interstellar space
2 : a galaxy other than the Milky Way galaxy —not used technically
Source : Merriam -Webster
Etymology : Nebula comes to us from Latin, where it meant “mist” or “cloud.” In its earliest English uses in the 1600s, nebula referred to a cloudy speck or film on the eye that caused vision problems. It was first applied to great interstellar clouds of gas and dust in the early 1700s. The adjective nebulous comes from the same Latin root as nebula, but the first uses of nebulous don’t appear in English until the late 1700s, well after the discovery of interstellar nebulae.
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