Supernova remnant E0102-72, composite image. Located in the Small Magellanic Cloud (SMC), this is the remnants of a star that exploded, with the glow produced as the material ejected collides with the surrounding interstellar medium. The image combined X-ray (blue), optical (green), and radio (red) data from the Chandra X-ray Observatory (CXO), Hubble Space Telescope (HST) and the Australia Telescope Compact Array (ATCA). The X-ray data shows gas that has been heated to millions of degrees by the rebounding, or reverse shock wave. The radio waves are due to extremely high-energy electrons spiraling around magnetic field lines in the gas and trace the outward moving shock wave. This supernova remnant is around 200,000 light years from Earth, in the constellation of Tucana. Image published in 2000.