Measuring the time it takes for X-rays to travel from the inside of a black hole to Earth allows researchers to get an idea of what lies inside a black hole. Photo: NASA/Swift/Aurore Simonnet, Sonoma State U.

Sleeping black hole swallows star and is now bursting out X-rays

Studying the X-rays being emitted can help astronomers understand how the biggest black holes in the universe are formed

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Measuring the time it takes for X-rays to travel from the inside of a black hole to Earth allows researchers to get an idea of what lies inside a black hole. Photo: NASA/Swift/Aurore Simonnet, Sonoma State U.
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