Westerlund 2

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What Wikipedia says

Westerlund 2 is an obscured compact young star cluster (perhaps even a super star cluster) in the Milky Way, with an estimated age of about one or two million years. It contains some of the hottest, brightest, and most massive stars known.

Excerpt from the Wikipedia article “Westerlund 2”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, ESA, the Hubble Heritage Team (STScI/AURA), A. Nota (ESA/STScI), and the Westerlund 2 Science Team, Public domain, via Wikimedia Commons.