Helix Nebula (NGC7293)
The Helix Nebula (NGC 7293) is a large planetary nebula located in the constellation Aquarius. It is one of the closest planetary nebulae to the Earth at an estimated distance is about 700 light-years.
It was formed by an intermediate to low-mass star, which shed its outer layers near the end of its evolution. The remnant central stellar core 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.
Shot in mapped colour, Hydrogen alpha emissions mappeed to red and Oxygen III emissions mapped to green and blue.