0:00 - Why time is a dimension 1:43 - Speed of light was a problem 3:54 - How Einstein resolved problem 4:54 - Minkowski geometry 6:59 - What're world lines 7:30 - What's a light cone 9:19 - How ...

We've been through the first few episodes of our crash course on general relativity, and came out alive! But it's officially "time" for CURVED spacetime. Join Gabe on this week’s episode of PBS Space ...

Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time: the interwoven fabric of space and time at the heart of Albert Einstein’s theory of relativity.

I. Basic Philosophy of the Original Thesis and the Thesis PoemAlbert Einstein's theory of relativity fundamentally changed ...

In 1905, a 26-year-old patent clerk named Albert Einstein looked at the universe and discovered that time was not what we thought it was. It was not linear. For centuries, everyone assumed the same ...

Newton’s law of universal gravitation conceived gravity as a force acting at a distance within an absolute Euclidean space and universal time. This framework was superseded by the geometric paradigm ...

These photos of 70-foot-tall light cones shimmering over the Californian desert may look beautiful, but scratch the surface and they actually represent fascinating theories about the space-time ...

We all have some past events that we'd like to undo. These can be minor moments, such as a failed exam or an argument with friends, or world-changing incidents, such as the 2019 outbreak that led to ...

Could black hole shadows reveal new theories of gravity? A black hole is a region of space where gravity is so strong that nothing, not even light, can escape. Astronomers captured the first image of ...