Bok
08-07-2015, 05:19 PM
This colorful bubble is a planetary nebula called NGC 6818, also known as the Little Gem Nebula. The rich glow of the cloud is just over half a light-year across — humongous compared to its tiny central star — but still a little gem on a cosmic scale.
More... (http://www.nasa.gov/image-feature/goddard/hubble-finds-a-little-gem)
More... (http://www.nasa.gov/image-feature/goddard/hubble-finds-a-little-gem)