An international team of astronomers using data from NASA’s Chandra X-ray Observatory has suggested that a stellar explosion known as the Kepler’s supernova was not only more powerful, but might have also occurred at a greater distance, than previously thought. Composite image of the Kepler’s supernova remnant: Chandra X-ray data show different colors in a range from lower to higher energies: red, yellow, green, blue and purple; optical...
