The crimson arc in our image is thought to be a remnant of a supernova that exploded roughly two that exploded roughly two million years ago. Barnard’s Loop is an that can be faintly seen by the naked ...

This image of the iconic Horsehead Nebula was taken with the Mosaic camera at the 4-meter Mayall telescope on Kitt Peak, T.A. Rector (NOAO/AURA/NSF) and the Hubble Heritage Team (STSci/AURA/NASA) ...