This is pretty neat. The radiation was a tell-tale sign of iron atoms that had been so battered that they lost nine electrons — the so-called “Fe X” (or “Iron

This is pretty neat. The radiation was a tell-tale sign of iron atoms that had been so battered that they lost nine electrons — the so-called “Fe X” (or “Iron 10”) line. The researchers checked another candidate and found the same trait. While neither object had the traditional appearance of a feeding black hole, it was hard to imagine what else could be doing such violence to iron atoms.