A new image using data collected by NASA's James Webb Space Telescope shows off one of the most perfect "Einstein rings" ever captured.
Stars appear to twinkle because the light from these distant objects passes through wobbly air in the atmosphere.
Octopuses are one of the most successful camouflaging animals in the world. But exactly how they pull off their rapid, high-resolution color changes is still a mystery.
The length of a second hasn't been updated in 70 years, but ultraprecise atomic optical clocks are on track to change that.
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