The Carina Nebula, a star-forming region located a mere 7,500 light years from Earth in the Sagittar

[soothsayer]

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Chandra Observatory
@chandraxray
This enchanting Chandra image shows the Carina Nebula, a star-forming region located a mere 7,500 light years from Earth in the Sagittarius-Carina arm of our Milky Way galaxy. This image spans approximately 148 light years and sparkles with the light of more than 13,000 stars.✨

[eppur_se_muova]

1. So I had to wonder ... why aren't those named as clusters ? They are.

The nebula has within its boundaries the large Carina OB1 association and several related open clusters, including numerous O-type stars and several Wolf–Rayet stars. Carina OB1 encompasses the star clusters Trumpler 14 and Trumpler 16. Trumpler 14 is one of the youngest known star clusters at half a million years old. Trumpler 16 is the home of WR 25, currently the most luminous star known in our Milky Way galaxy, together with the less luminous but more massive and famous Eta Carinae star system and the O2 supergiant HD 93129A. Trumpler 15, Collinder 228, Collinder 232, NGC 3324, and NGC 3293 are also considered members of the association. NGC 3293 is the oldest and furthest from Trumpler 14, indicating sequential and ongoing star formation.

https://en.wikipedia.org/wiki/Carina_Nebula