Einstein believed that black holes didn't really exist. But they do: that much we know. We don't know much else about them.

A new theory suggests our universe and a time-reversed twin could emerge together. This quantum approach avoids singularities and offers an explanation for dark energy. Traditional ...

Priyamvada Natarajan is an astrophysicist at Yale University who specializes in studying the invisible universe: black holes and dark matter. We recently discussed these enigmatic places with her.

If dark energy is weakening, it stands to reason that eventually gravity will become dominant and the universe will begin to ...

Instead, the theory proposes that the universe is expanding as a result ... this work and the standard model is that the temporal singularity occurred only once in the latter, but more than ...

with an "anti-universe" twin where time runs in the opposite direction—rather than exploding from an infinitely small and dense point, or "singularity." This is the conclusion of physicist Naman Kumar ...

What if everything we know—the stars, the galaxies, the expanding fabric of space-time—isn’t floating in a limitless void, ...

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