spacetime

Nov 18 2025

New Book: The Essential Book of Time

StenBlog

We all live in time, but remarkably time itself remains one of the most mysterious aspects to our existence. Not even Einstein’s fabulous theories of Relativity can help us deeply understand what time is, why it even exists, or why humans and all sentient life experience it the way they do. This...

physics time general relativity quantum gravity spacetime loop quantum gravity

Apr 11 2016

In Einstein’s General Theory of Relativity, space and time...

1ucasvb's lab

In Einstein’s General Theory of Relativity, space and time are unified in a single entity called spacetime. This is the “stage” in which the laws of physics operate. In Einstein’s theory, the presence of mass and energy warps spacetime, and it is this curvature that affects objects in the way we...

physics time cosmology astrophysics video illustration animation einstein general relativity spacetime astronomy gif