Gravitational Lensing: What It Is And How It Is Helping Us Discover New Galaxies

The video explores the concept of lenses, focusing on gravitational lensing, a phenomenon where gravity acts as a lens to bend light from distant galaxies. This is rooted in Einstein's theory of general relativity, which suggests that massive objects distort space-time, affecting light paths. Gravitational lensing allows astronomers to discover new galaxies and study dark matter, which is invisible but has mass. The video also discusses the Einstein ring, a visual effect of perfect alignment in gravitational lensing, and highlights ongoing studies like the Dark Energy Survey to map dark matter in the universe.

In what ways can gravitational lensing help astronomers discover new celestial bodies?

How does dark matter interact with light, according to the text?

What role does general relativity play in our understanding of the universe?