We know how the universe began. An event we call the Big Bang started it all about 13.8 billion years ago. How the universe ...

If ultimately true, the universe will reach its maximum size around 11 billion years from now. At that point, physics (and ...

The mass of the entire universe can also be estimated by measuring how the expansion rate has changed since the Big Bang. Normal matter and dark matter have acted to decelerate cosmic expansion, while ...

The universe is approaching the midpoint of its 33-billion-year lifespan, a Cornell physicist calculates with new data from ...

No one knows what kicked off the Big Bang that eventually allowed the stars to begin forming. Adolf Schaller for STScI, CC BY How can a Big Bang have been the start of the universe, since intense ...

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density ...

Cosmic inflation tries to describe one brief but crucial phase in the Big Bang that launched the universe onto its expansion course. Many textbooks and science educators have attempted to describe the ...

While it's much smaller than the largest supermassive black holes detected, it's still a whopper considering how early in the history of the universe it appeared. An enormous black hole in the early ...

We’ve grown up with the idea that the universe will expand forever, meaning the "cosmological constant" is positive. What if ...