New Delhi: About 350 years ago, Cassiopeia A at a distance of 11,000 years ran out of nuclear fuel. The core of the massive star collapsed, resulting in a shockwave that ripped apart the star, violently dumping its outer layers into the surrounding environment. A pulse of intense X-ray and ultraviolet light was produced by the shockwave reaching the surface. This light has now reached interstellar gas and dust. The injection of heat into the material is causing it to glow in infrared light, revealing the fine details in the interstellar medium, resembling knots and whorls in wood grain. Because of the light echo, the........

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