The Helix Nebula, though seemingly a bubble, is actually a trillion-mile-long tunnel of glowing gases. We just happen to see down it’s center because it is pointed at Earth. It is the result of a dying star (the glowing dot at the center) venting gases into space. The cloud and it’s filaments formed when hot gases collided with older, colder waves of dust and gas emptied previously by the doomed star.
The Hubble