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This star survived a black hole—and came back for more

Lightning might not strike twice, but black holes apparently do. An international group of researchers led by Tel Aviv ...

Scientists Found a Black Hole That Shouldn’t Exist. Now Physics Has a Problem.

At 225 solar masses, this gargantuan merger of two black holes challenges our thinking on these famously elusive objects.
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I Love Sci-Fi Movies, But I Just Can't Bring Myself to Rewatch These 10 Confusing Time-Travel Films

Time travel is a staple of sci-fi, but sometimes, even hardcore sci-fi fans can't wrap their minds around the most baffling ...