Here are three 5-minute long videos explaining very essential concepts in a simple and graphical form. Please watch them before the lecture to have a better grasp of what space-time means (after all, we live in 4-dimensional space-time, so it's very relevant to your everyday life, even though you may not be aware of it).

In the first clip you'll learn to use the concept/tool  called the world-line.

The second uses the concepts to explain why the speed of light is always the same regardless of how you move (paradigm change related to special theory of relativity, Einstein 1905).

In the third, you'll learn how mass affects space-time, and how gravity can be thought as a geometrical effect rather than a classical force (paradigm change related to special theory of relativity, Einstein 1915).

1. Space-time and world-lines


2. Space-time and speed of light (special relativity)


3. Space-time and gravity (general relativity)


Last modified: Thursday, 2 March 2017, 11:26 AM