SATURDAY MORNING PHYSICS
Gravitational Lensing -- Nature's Largest Telescopes
Gravitational lensing deflects light from distant sources when it travels close to massive objects, such as clusters of galaxies. Some of these clusters become very effective lenses, magnifying the images of the galaxies behind them, and allow us to see galaxies that otherwise would be too faint to observe even with the biggest telescopes on earth or in space. In this talk, Dr. Sharon will show some examples of spectacular gravitational lenses and explain how she and her colleagues use them to study the Universe when it was a fraction of its current age.