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 ...

For centuries, humanity has pondered the ultimate fate of the universe. From theories of infinite expansion to the concept of ...

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

Physicists predict the universe’s expansion will reverse, ending in a dramatic big crunch about 20 billion years from now.

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

What is the biggest object in the universe? Learn more about the biggest objects in the universe, including galaxies, galaxy ...

For science-fiction enthusiasts, that’s a bit depressing. Space is big, and while the speed of light is incredibly fast to us ...

Einstein’s version of dark energy is known as the cosmological constant. It implies a fixed amount of dark energy in each ...

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