(click on image to enlarge)
NASA's description: Sparkling at the center of this beautiful image is a star located about 30,000 light-years away. The distinctive blue bubble appearing to encircle the star is a nebula — an interstellar cloud of dust, hydrogen, helium and other gases. The bubble — estimated to have formed around 20,000 years ago — is expanding at a rate of around 220,000 kilometers (136,700 miles) per hour! Details:http://go.nasa.gov/1QLO8Pj
