What Is Gravitational Lensing?

The video explores gravitational lensing, a phenomenon where massive objects bend space-time, affecting the path of light. It explains how lenses work, Einstein's prediction of gravitational lensing, and its first observation in 1979. The video discusses various lensing effects, such as the Einstein Cross and Einstein Ring, and how these effects help discover celestial objects, including planets. The video concludes with an invitation to join Scishow Space for more exploration.

What is the primary function of a lens in devices like microscopes and telescopes?

• To reflect light

• To focus light

• To absorb light

• To scatter light

How does gravity affect light according to Einstein's theory?

• It speeds up light

• It changes the color of light

• It bends the path of light

• It stops light

What was the first gravitational lensing effect observed in 1979?

• Huckra's Lens

• Einstein Cross

• Double Quasar

• Einstein Ring

What is an Einstein Cross?

• A halo of light around a galaxy

• A single image of a quasar

• A distorted image of a planet

• Four images of the same object arranged around a lens

How can gravitational lensing indicate the presence of a planet in a star system?

• By causing a temporary increase in brightness

• By changing the color of the star

• By making the star disappear

• By altering the star's temperature