The supernova left behind a dense central core 12.5 miles wide that was first spotted in 1999 by NASA's Chandra X-ray Observatory.
超新星爆发后留下了一个直径12.5英里的致密核心，NASA的钱德拉X射线天文台于1999年第一次观察到了这一核心。
Now the galaxy is full of gas and dust, which could hide a distant supernova optically, but the remnant would still produce detectable radio waves and X-rays.
现在，星系充满了气体和灰尘，掩盖了遥远的超新星的可见性，但是(它的)残骸依然放射出可检测的无线电波和X射线。
The supernova explosions that create and spread heavy elements also unleash a torrent of high-energy radiation: gamma rays, X-rays, and ultraviolet light.
创造并散播重元素的超新星爆发同样释放出一股高能辐射的激流：伽玛射线，X射线，紫外线。
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