This delicate bubble is the remnant of a supernova, SNR 0509-67.5, which is located in the Large Magellanic Cloud, about 160,000 light-years from Earth.
The nebula is about 23 light-years across and is expanding at more than 11 million miles per hour. The image was provided by Hubble and augmented below with data from the Chandra X-ray observatory. The blue and green gossamer structure in the center is material heated by the expanding shock-wave of the supernova, which occurred almost 400 years ago.
See the Hubble site for more information and images.
Till next time,