What is this?

I am referring to the black mass seen here -


https://www.legacysurvey.org//viewer/?ra=322.1773&dec=12.0075&layer=sdss&zoom=16

https://viewer.legacysurvey.org//?ra=322.1778&dec=12.0066&layer=ls-dr9&zoom=16&ngc&sga

Not sure what you mean by black mass?

If you mean the area where the green square is, thats a gap between the main body of the galaxy and its loose spiral arm.

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It’s called “space”. Haha I kid. Welcome!

Hey thanks for the replies , loose spiral arm seems right. Thanks!