Here’s 6 hours of the Helix Nebula through narrowband filters processed in bi-color palette to give a more natural appearance. The Helix Nebula is an example of a planetary nebula, formed at the end of a star's evolution. Gases from the star in the surrounding space appear, from our vantage point, as if we are looking down a helix structure. The remnant central stellar core, known as a planetary nebula nucleus or PNN, is destined to become a white dwarf star. The observed glow of the central star is so energetic that it causes the previously expelled gases to brightly fluoresce. This image was taken betweeen November 25 and 28, 2015. I have a 2010 photo of the Helix taken through broadband filters and a hydrogen alpha filter here.