Gravitational lenses: what are they and how do they work?
A phenomenon predicted over a century ago by Einstein's general theory of relativity, called "gravitational lensing," is today one of the most powerful tools available to astrophysicists to study the properties of the universe and the matter and energy it contains.
Let's try to understand a little better what gravitational lenses are and how they are used to study the universe.
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WRITTEN AND PRODUCED by Amedeo Balbi, professor of astronomy and astrophysics at the University of Rome Tor Vergata.
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