This colorful bubble is a planetary nebula called NGC 6818, also known as the Little Gem Nebula. It is located in the constellation of Sagittarius (The Archer), roughly 6,000 light-years away from us. 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.
Image credit: ESA/Hubble & NASA, Acknowledgement: Judy Schmidt
Last Updated: Aug. 7, 2015
Editor: Ashley Morrow