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Gravitational Lensing Trivia Questions

How much do you really know about Gravitational Lensing? Below are 8 true or false statements. Click each one to reveal the answer and explanation.

1.

Black holes cannot cause gravitational lensing because their gravity is too intense.

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Easy
✗ FALSE

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

2.

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

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Easy
✓ TRUE

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

3.

Gravitational lensing can magnify distant galaxies, letting us see details otherwise invisible.

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Easy
✓ TRUE

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

4.

Gravitational lensing can create multiple images of the same distant galaxy.

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Medium
✓ TRUE

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

5.

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

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Medium
✗ FALSE

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

6.

Dark matter can be mapped by analyzing how it distorts light from background galaxies.

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Medium
✓ TRUE

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

7.

Gravitational lensing can make a distant supernova appear brighter and also delayed in time.

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Hard
✗ 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.

8.

The first confirmed gravitational lens was discovered in 1919 during a solar eclipse.

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Hard
✗ FALSE

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

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