Space: Space, stars and all things out there
The Ring Nebula about one light year across. But look closer, into the barrel shaped cloud...
Cometary knots: So called because of their resemblence to comets, they are actually much larger - their heads are several billion miles across (roughly twice the size of the our solar system itself) while their tails, pointing radially away from the central star, stretch over 100 billion miles.
From the top Not the same nebula, but the square nebula could be what we'd see of the ring nebula, if we looked from the top.