Einstein's theory of Relativity lead to many new revelations about the nature of space and time. The first stage of this process was the development of Special Relativity in 1903, while the second stage (General Relativity) was not completed until 1915. It is this latter stage that ties in to gravity and the so-called curvature of spacetime. Below, we have provided links to a number of website that will help you understand or visualize what we have learned.
There are many web pages dedicated to explaining special relativity. Some of our favorite are listed on the left below. On the right are visualization pages, links to show you what things look like when either you or they travel at the speed of light!
Here are our favorite web sites explaining general relativity and curved spacetime. General Relativity can get pretty technical pretty fast, so we've described the rough level of each site below.
| Sites | Level |
| Relativity Tutorial | Sort sites in order of difficulty and explain here. |
| From Special to General | |
| Cambridge Relativity | |
| Spacetime Wrinkles | |
| A more advanced Relativity Tutorial |
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