Dark-energy evidence suggests the universe will end in a “big crunch” roughly 20 billion years from now. The universe is nearing the halfway point of what may be a 33-billion-year lifespan, according ...

Such an exponential expansion may seem minor, but it is equivalent to a grape in the palm of your hand swelling to become ...

If recent discoveries that dark energy is evolving hold any water, our Universe will collapse under its own gravity on a ...

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density – given that the universe contains a lot of relatively empty space, could ...

Astronomers have discovered what may be the brightest object in the universe, a quasar with a black hole at its heart growing so fast that it swallows the equivalent of a sun a day. The ...

Countless mysteries remain about the universe, from its size and origin to the potential of AI, dark energy, and the limits of human understanding.

The observable universe contains so much matter and so many planets that, if it extends infinitely, identical copies of people could exist somewhere else.