NASA Scientists Predict Black Hole Light Echo Show

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About 75 of a flares X-rays (black line) head toward Earth without completing an orbit. But the remainder orbit the black hole one or more times (red blue green pink and orange lines) before heading our way. Credit: Keigo Fukumura
About 75% of a flare’s X-rays (black line) head toward Earth without completing an orbit. But the remainder orbit the black hole one or more times (red, blue, green, pink, and orange lines) before heading our way. Credit: Keigo Fukumura

It’s well known that black holes can slow time to a crawl and tidally stretch large objects into spaghetti-like strands. But according to new theoretical research from two NASA astrophysicists, the wrenching gravity just outside the outer boundary of a black hole can produce yet another bizarre effect: light echoes.


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