Cosmology and quantum physics both offer tantalizing possibilities that we inhabit just one reality among many. But testing ...

Hints of a mirror cosmos have a way of gripping the imagination, and recent chatter about “first proof” of a parallel universe has pushed that fascination back into the spotlight. Behind the viral ...

A team of Chinese researchers has suggested that the mysterious gravitational wave detected in 2019, known as GW190521, may not have originated in our universe at all, but instead from a parallel ...