Why do black holes bend light around them?
Quick Answer
Black holes bend light because their gravity curves spacetime itself. Light follows the curved geometry, so its path appears bent to us.
The Full Story
In Einstein’s theory, gravity is not a force pulling light in the ordinary sense; it is the curvature of spacetime around mass. Near a black hole, that curvature becomes very strong, so even photons follow sharply curved paths. This causes gravitational lensing, multiple images, and dramatic arcs seen in astronomical observations. The first strong evidence for light bending by gravity came from Eddington’s 1919 eclipse measurements, and black holes produce an extreme version of the same effect.
Key Facts
YouTube Angle
Suggested video title for this topic:
"Why does a black hole act like a cosmic lens?"
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