When we go backwards in time through the history of the cosmos, the distances and volumes shrink, while the average energy ...

The early universe started with what we call The Big Bang, which was a very hot environment which then expanded and cooled.

These are big, literally cosmic questions, and astronomers continue to struggle to nail down the answers. Different ...

The Big Bang theory suggests that the universe began as a hot, dense point, expanding into the cosmos we observe today.

Time For Reflection Our understanding of the universe, as advanced as it is, is still riddled with paradoxes and huge ...

The kilonova briefly mimicked the conditions immediately following the Big Bang, and allowed scientists to confirm the source ...

Our knowledge of physics — gained through astrophysical experiments, or in laboratories via machines such as particle ...

The black hole's voracious appetite, which has allowed it to pile on more than seven million solar masses in just 12 million ...

Our most powerful telescopes have revealed that the cosmos is surprisingly simple on the largest visible scales. Likewise, ...

A radical hypothesis suggesting black holes could be behind the accelerating expansion of our universe has been stirring up ...

When the two neutron stars collide, the initial kilonova of exploded neutron star guts is extremely hot, billions of degrees, ...

An elusive particle that first formed in the hot, dense maelstrom of the early universe has puzzled physicists for decades.