The accelerating expansion of the Universe might not be just an unexplained phenomenon — according to a new proposal by theoretical physicists, it could be a fundamental feature woven into the very ...

Out of the limelight, theoretical physicists continue to seek a mathematical model that can explain the universe's particles ...

String theory implies that the particles that comprise all the matter that you see in the universe—and all the forces that allow matter to interact—are made of tiny vibrating strands of energy.

Theoretical physicist Michio Kaku explains why he thinks string theory is the best way to understand how the universe works. On Mount Chimaera, fire has been spitting out from rocks for over 2,500 ...