Albert Einstein (1879 to 1955)
Einstein taught us that mass and energy are two forms of the same thing and that gravity is better understood as the curvature of spacetime that guides motion.
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Relativitiy
Relativity Principle
The laws of physics work the same for all observers moving at a constant speed. There is no absolute state of rest.
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Special Relativity
Special Relativity explains the relationship between space, time, mass, and energy. It shows that time and space are not separate entities but are connected as a single entity called spacetime. Additionally, it introduced the famous equation E=mc², which demonstrates that mass is engergy, energy is mass. They are equivalent and can be converted into each
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Doppler Effect Observed for Stars
In 1842, the Doppler effect was proposed by Christian Doppler. First confirmed for sound in 1845, then for light in 1848.
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Doppler Effect for Sound and Light
In 1842, Christian Doppler wrote about the doppler effect in stars. It was first confirmed with sound in 1845, then with light in 1848. The big moment came in 1868 when, for the first time, we could tell which stars were coming and going.
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