HFG1 features a prominent bluish arc-shaped shock wave, known as a bow shock, created as the binary ... This small planetary nebula, like others like it, was formed by gases in the outer layers ...

That fuzzy splotch, visible to the naked eye when it is really dark (and easily seen through binoculars) is the Orion Nebula. Throughout the nebula (which is about 30 light years wide), we see a ...