Observations show the universe appears flat, yet its true size and global shape beyond the observable horizon may remain forever unknown.

In this video, we explore the vastness of the universe and attempt to quantify its size. We delve into the concepts of cosmic measurements, the observable universe, and the theories that explain the ...

Since conventional explanations have failed to pony up dark matter, one physicist is looking towards the unconventional. In a series of two papers, physicist Stefano Profumo of the University of ...

Physicists have started to treat a once-fringe idea with surprising seriousness: that our entire observable universe might be the interior of a black hole that formed in some larger cosmos. The notion ...