Scientists have many big questions to tackle about the universe, including how big it actually is. But even the proposed ...

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, ...

Depending on how you look at it, the universe might not have an "end," after all. Whether the universe will "end" at all is ...

An expanding universe complicates this picture just a little bit, because the universe absolutely refuses to be ...

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...

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 ...

Gazing up at the stars at night, it’s easy to imagine that space goes on forever. But cosmologists know that the universe actually has limits. First, their best models indicate that space and time had ...

In the beginning, the Big Bang happened, sending everything in the universe expanding outward and apart, from a dense hot point. Since then, all that matter and energy has continued to move outward, ...

A new study casts doubt on the universe’s accelerating expansion, suggesting dark energy might be weakening over time.

Mathematical quirks of our universe have led some cosmologists to wonder whether the cosmos was actually born in a black hole. Parallels in the physics of the universe and that of black holes have led ...