The Owl Nebula is a planetary nebula located about 2,030 light-years away in the constellation Ursa Major. It is estimated to be around 8,000 years old. The Horsehead Nebula, located in the ...
The Helix Nebula is an example of a planetary nebula. Though it looks like a bubble or eye from Earth's point of view, the Helix is actually a trillion-mile-long tunnel of glowing gases. In its center ...