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Because a black hole is a pure gravitational field left behind when a massive star collapses to a point, the collision involved no matter and produced no visible radiation.

This hypothetical signal is distinct from a much longer-wavelength one from even earlier on, which might appear in the universe’s oldest visible radiation: the cosmic microwave background.

This hypothetical signal is distinct from a much longer-wavelength one from even earlier on, which might appear in the Universe’s oldest visible radiation: the cosmic microwave background.

Scientists had predicted black holes formed during the universe's earliest days, but because of gas and dust absorbing all visible radiation save for "the highest-energy X-rays," we lacked observational evidence—until now.

This is because it is surrounded by a huge envelope of dust that absorbs almost all its visible radiation and re-emits it as infrared light.