Sagittarius B2

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What Wikipedia says

Sagittarius B2 (Sgr B2) is a giant molecular cloud of gas and dust that is located about 120 parsecs (390 ly) from the center of the Milky Way. This complex is the largest molecular cloud in the vicinity of the core and one of the largest in the galaxy, spanning a region about 45 parsecs (150 ly) across.

Excerpt from the Wikipedia article “Sagittarius B2”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: europeanspaceagency, CC BY-SA 4.0, via Wikimedia Commons.