NASA(@NASA):While observing the universe, @NASAHubble caught a galaxy cluster smiling for the camera. 😊 The smile lines are arcs caused by an effect known as gravitational lensing, where massive structures warp spacetime with their powerful gravitational forces and act as a cosmic lens.

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参加 December 2007

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NASA@NASA

2026.10.11 16:30

While observing the universe, @NASAHubble caught a galaxy cluster smiling for the camera. 😊 The smile lines are arcs caused by an effect known as gravitational lensing, where massive structures warp spacetime with their powerful gravitational forces and act as a cosmic lens.