Masked Bannerfish and Pennant Bannerfish, Heniochus monoceros, South Male Atoll, Indian Ocean, Maldives

Masked bannerfish (Heniochus monoceros), Ailuk atoll, Marshall Islands, Pacific

This is the nebula rich region in the constellation of Monoceros the Unicorn with the dark Cone Nebula (left of centre) and the small V-shaped and bright Hubble's Variable Nebula at bottom, a reflection nebula that varies in form and brightness. Above the Cone Nebula is the triangular Christmas Tree Cluster, NGC 2264, here upside down as the bright blue star 15 Mon is the base of the tree. The large region of nebulosity is Sharpless 2-273. The V-shaped dark nebula above centre is LDN 1603.

The area of the Rosette Nebula (bottom) and Christmas Tree Cluster (top) in Monoceros with the Fornax Lightrack tracker and 200mm lens + Canon 5D MkII. The nebulosity at top includes the Cone Nebula.

The constellation of Orion the Hunter, at right, and his two Hunting Dogs and their brightest stars: Procyon in Canis Minor (at left) and Sirius in Canis Major (at bottom).

Night Sky, Zagros Mountains, Iran

[DC], Male Narwhal (monodon monoceros) in clear blue ocean water near surface, View from below.