The Horsehead Nebula, Barnard 33, is a dark nebula in Orion back lit by the emission nebula IC 434, which glows due to ionization from the nearby hot blue star Sigma Orionis. Stellar winds from Sigma Orionis are pushing the emission nebula outward causing both the striations in the nebula and the billowing shock front where the emission nebula is being compressed against a dark molecular cloud, of which the Horsehead is a persistant protrusion. 

Telescope: Celestron Compustar C14.

Exposures: Ha:R:G:B=420:80:80:80=11 hours total exposure at f/8.3. 

This image was published in the July, 2023 issue of Astronomy magazine.