Curated category
General relativity
- Black holeIn 1784, John Michell published a letter suggesting that some stars could be so massive and dense that light would never escape their gravity.
- Einstein–de Sitter universeAlbert Einstein and Willem de Sitter met in 1932 to discuss the nature of space. They had just learned that Edwin Hubble found a linear relation between…
- Einstein's static universeAlbert Einstein published his static universe model in the year 1917. This work arrived shortly after he completed the general theory of relativity.
- Geodesics in general relativityA freely falling particle traces a path through four-dimensional spacetime that physicists call a geodesic. This concept generalizes the idea of a straight…
- MicroscopeThe Micro-Satellite à traînée Compensée pour l'Observation du Principe d'Equivalence carried a mission to test the universality of free fall.
- Einstein's thought experimentsAlbert Einstein's career was defined by his use of visualized thought experiments as a fundamental tool for understanding physical issues.
- Cosmological constantIn 1917, Albert Einstein published a paper titled Cosmological considerations in the General Theory of Relativity. He added a specific term to his field…
- Einstein field equationsAlbert Einstein published the field equations in November 1915. The presentation occurred during a series of lectures at the Prussian Academy of Sciences in…
- Vulcan (hypothetical planet)In 1611, the German astronomer Christoph Scheiner reported seeing dark spots on the Sun. He believed these were small planets orbiting closer to the star…