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Chemical fingerprints reveal hidden binary pasts of massive stars

More than 70% of massive stars are born in close binary systems, where gravitational tugs and mass transfer between companions dramatically alter their evolution. Yet once the interaction ends—whether through mass transfer, merger or the supernova explosion of one...

What if there’s a star inside a black hole?

There is a question that often comes up at every public talk I do, and I have never had a good answer to it—well, not an entirely confident one. What’s inside a black hole? The textbook reply is a singularity. Cross the event horizon, and everything falls inward...