This delicate shell, photographed by NASA's Hubble Space Telescope, appears to float serenely in the depths of space, but this apparent calm hides a tumultuous end. The gaseous envelope formed when the expanding shock wave and ejected material from a supernova passed through the nearby interstellar medium.
Called SNR 0509, the bubble is the visible remnant of a powerful stellar explosion in the Large Magellanic Cloud, a small galaxy about 160,000 light-years from Earth.
The bubble-shaped veil of gas is 23 light years across and is expanding at more than 18 million km/h!
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