The Crescent Nebula is an enormous cloud of glowing gas, located about 5,000 light-years away in the constellation Cygnus. That means the light in this photograph set out toward Earth around 3,000 BC, long before the Great Pyramid of Giza was built. The nebula itself is 25 light-years across.
At its centre is a remarkable Wolf-Rayet Star (WR-136) that’s nearing the end of its life. Over thousands of years, it has blown huge amounts of gas into space, creating this beautiful, intricate shell. The glowing blue structures show areas rich in oxygen, while the warmer colours highlight hydrogen.
Eventually, that central star is expected to end its life in a supernova, although nobody knows exactly when.
What we’re seeing is a star slowly shaping the space around it, as it approaches the final chapter of its existence. 

This is one of my more recent pieces of work and contains 144 exposures totalling , 7 hours and 12 minutes.
It was taken over two separate nights in a Bortle 4 Sky.

The equipment used was:
Celestron Edge HD 9.25
ASI ZWO2400MC Pro OSC
Optilong L eXtreme Filter
ZWO AM5
ASIAir Plus
William Optics 50mm Guide Scope
ASI ZWO 174mm Mini Guide Camera.

The image was processed using PixInsight and Photoshop.