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(2/2) Those photons are then ionizing the surrounding gas, which leads to that giant nebulosity.
I think you've found an -incredible- HII region. That verrrry dense cluster of blue stars is probably emitting a ton of UV photons (1/2)
Wasn't sure if I found a HUGE ghost or just nebulosity on the image!
Nevertheles, one striking picture!
A nice bright cluster with nebulosity. One of the most striking finds I have seen so far.