Three-colour composite of the sky region of M 17, a H II region excited by a cluster of young, hot stars. A large silhouette disc has been found to the south-west of the cluster centre. The present image was obtained with the ISAAC near-infrared instrument at the 8.2-m VLT ANTU telescope at Paranal.
Image Credit: ESO
Explanation from: https://www.eso.org/public/images/eso0416a/
Arsalan
Sunday, September 3, 2017