Question 1

True or false: Lensing by a galaxy cluster can create a giant arc that is actually a stretched, magnified galaxy.

Accepted Answer

True. True. Strong lensing by clusters can stretch a background galaxy into a long, thin arc—one of the most stunning lensing effects.

Question 2

True or false: Black holes cannot cause gravitational lensing because their gravity is too intense.

Accepted Answer

False. False. Black holes actually produce strong lensing, warping spacetime and creating dramatic effects like Einstein rings.

Question 3

True or false: Gravitational lensing can magnify distant galaxies, letting us see details otherwise invisible.

Accepted Answer

True. True. The lens acts like a cosmic magnifying glass, boosting brightness and resolution of faraway objects, aiding deep-space studies.

Question 4

True or false: Gravitational lensing can create multiple images of the same distant galaxy.

Accepted Answer

True. Yes, strong lensing by massive objects can bend light from a single galaxy along different paths, producing multiple, sometimes identical images.

Question 5

True or false: Dark matter can be mapped by analyzing how it distorts light from background galaxies.

Accepted Answer

True. Yes, weak gravitational lensing reveals the distribution of dark matter by subtle shape distortions in background galaxies.

Question 6

True or false: Gravitational lensing only works with visible light, not radio or X-rays.

Accepted Answer

False. Nope, lensing affects all electromagnetic radiation equally—it bends radio waves, X-rays, and gamma rays just like visible light.

Question 7

True or false: The first confirmed gravitational lens was discovered in 1919 during a solar eclipse.

Accepted Answer

False. That eclipse confirmed general relativity via starlight deflection, not a lens. The first gravitational lens (twin quasar) was found in 1979.

Question 8

True or false: Gravitational lensing can make a distant supernova appear brighter and also delayed in time.

Accepted Answer

False. False—it can make it appear brighter and at multiple times in different images, but the light itself isn't delayed; we see it at different arrival times.

Gravitational Lensing Trivia Questions