Introduction to general relativity Reference Libraries
Gravitational Lens -- A gravitational lens is formed when the light from a very distant, bright object (such as a quasar) is "bent" around a massive object (such as a massive galaxy) between the bright object and the viewer. The process is known as gravitational lensing, and was one of the predictions made by Einstein's general relativity. Description In a gravitational lens, the...
- The navel or umbilicus.
- In Greek archaeology: A central boss, as on a shield, a bowl, etc.