For decades, cosmologists have had an awkward number sitting at the center of their equations. The universe is expanding, and ...

A new study suggests that dark matter could be made of 'relic' black holes that survived from a prior universe before the Big Bang. The theory merges the 'Big Bounce' model, in which the cosmos cycles ...

Before our universe existed, another one may have collapsed in on itself, and some of its black holes may have survived the ...

Astronomers are rethinking one of cosmology’s biggest mysteries: dark energy. New findings show that evolving dark energy models, tied to ultra-light axion particles, may better fit the universe’s ...