light

Ultra-fast, ultra-bright sprites caught forming in the act.
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Brilliant Red Sprite Lightning Caught on CameraBy Becky Oskin Last updated
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Why do stars twinkle?Stars appear to twinkle because the light from these distant objects passes through wobbly air in the atmosphere.
By Colin Stuart Published
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How do octopuses change color?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.
By Harry Baker Published
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Ultraprecise atomic optical clocks may redefine the length of a secondThe length of a second hasn't been updated in 70 years, but ultraprecise atomic optical clocks are on track to change that.
By Tia Ghose Published
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Can anything travel faster than the speed of light?Here's the science behind whether anything can travel faster than the speed of light.
By Joe Phelan Published
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Light pollution: Environmental impact, health risks and factsReference Discover the facts about light pollution and its impact on the environment and our health.
By Scott Dutfield Published
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How do energy saving light bulbs work?Reference Energy saving light bulbs: mechanics, efficiency and designs
By Mark Smith Published
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Your pupils can count … sort ofNew research suggests a person's pupil size can change based on the number of objects an individual observes in their visual field.
By Yasemin Saplakoglu Published
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What would happen if the speed of light were much lower?Here's what would happen if the speed of light were orders of magnitude slower.
By Ashley P. Taylor Published