The Helix Nebula is our closest nebulous neighbor, at a mere 650 light-years, roughly three-quarters of the distance from our Sun to the nearest star. With a diameter of nearly 3 light-years and it's close proximity to Earth, it took nine orbits and exposures to capture the entire nebula, which appears to be about one-half the diameter of the moon in our night sky. You are now looking down a Trillion-mile long tunnel of glowing gasses. A beautiful, fluorescing tube pointed directly at Earth. I suggest you take the time to click on it and have a look at the full-size image.