This is the Belt of Orion with its three blue stars across the top of the frame (L to R: Alnitak, Alnilam, and Mintaka), with the iconic Horsehead Nebula (aka B33) below Alnitak, with the dark Horsehead set against the bright nebula IC 434, aka Orion's Dagger. The pinkish nebula above Alnitak is NGC 2024, the Flame Nebula. The small blue reflection nebula left of the Horsehead is NGC 2023, with smaller IC 435 to the left of it. The field is filled with the large open cluster Collinder 70. The multiple star at bottom left of centre is Sigma Orionis. Many other smaller bits of reflection nebulas populate the field in and around the Belt.