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See how the sun evolves through the HR Diagram
Some (fairly confusing) java animations showing transformations in special relativity. Note: uniform motion and at rest are best, but still confusing.
See how motion contracts the lengths of rods in Special Relativity
In SR, light beams take more or less time to reflect depending on whether you are moving or not
See what it would be like to travel at near light speed
The Equivalence Principle shows that light in a gravitational field behaves the same as in a rocket.