Cat's Paw (NGC 6334)

NGC 6334 is one of the most active nurseries of massive stars in our galaxy. The nebula conceals freshly minted brilliant blue stars — each nearly ten times the mass of our Sun and born in the last few million years. The region is also home to many baby stars that are buried deep in the dust.
In total, the Cat’s Paw Nebula could contain several tens of thousands of stars.

The nebula appears red because its blue and green light are scattered and absorbed more efficiently by material between the nebula and Earth. The red light comes predominantly from hydrogen gas glowing under the intense glare of hot young stars.

(Adapted from ESO description).