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.
WATCH: A humanoid robot training for the “Robot Olympics” in Beijing runs too fast, fails to stop, slams into a safety cushion, and breaks at the waist