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German physicist Albert Einstein publishes his general theory of relativity in academic journal Annalen der Physik. General relativity describes gravity as a geometric property of space and time, unified into single four-dimensional continuum called space-time. It is more precise than old description of gravity by Isaac Newton.

### Essentials

### History

### From classical mechanics to general relativity

### Definition and basic applications

### Consequences of Einstein's theory

### Astrophysical applications

### Advanced concepts

### Relationship with quantum theory