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

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of ...

For more than a century, modern physics has rested on two towering frameworks that do not quite agree with each other.

Primordial black holes could rewrite our understanding of dark matter and the early universe. A record-breaking detection at ...