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Bright blue bands of light along breaking waves on a dark beach under a starry sky

Oceans

Why does the sea glow blue at night?

The light in the waves is alive, and it only switches on when the water is disturbed.

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A top-down view of a stainless steel pot containing water with small bubbles forming on the bottom and sides. Boiling Physics How does boiling work? A close-up of a leaf covered in small, orange-yellow spots of rust fungus. Rust Formation How does rust form? A digital illustration showing a network of satellites in orbit above a landscape featuring a large circular solar farm at twilight. Satellite Technology Why are satellites important? A woven basket filled with roasted coffee beans sits on a dark wooden table. Coffee Caffeine Why do coffee keep you awake? A wide landscape shot of a desert featuring a large saguaro cactus in the foreground, dry brush, and rugged mountains under a clear blue sky. Desert Formation Why do deserts exist? A pair of Japanese swords, a katana and a wakizashi, are displayed with their blades unsheathed next to their respective scabbards. The Daishō Why do samurai carry two swords? An underwater photograph of hydrothermal vents releasing mineral-rich plumes into the deep ocean. Ocean Salinity Why is sea water salty? An artistic rendering of a black hole with a glowing orange accretion disk against a black background. Black Hole Formation How do black holes exist? A wide panoramic view of the Martian surface showing several rovers and landers scattered across a rocky, orange landscape with solar panels in the foreground. Mars Rover Operations How do Mars rovers operate remotely? A high-resolution satellite image of Jupiter's Great Red Spot, showing its swirling atmospheric patterns and surrounding storm systems. Jupiter's Great Red Spot What causes Jupiter's Great Red Spot? A cluster of white and purple bamboo flowers blooming in a misty, lush green forest. Bamboo Flowering What happens when bamboo flowers? A pale half Moon against a deep blue late-afternoon sky The Moon Why can you see the Moon during the day? A close-up photo of a fluffy orange and white cat sleeping with its paw held up, showing its pink paw pads. Cat Purring Why do cats purr? An aerial view from an airplane window showing large ice floes and chunks of ice floating in a deep blue ocean. Ice Density Why does ice float on water? A vast dark rotating supercell thunderstorm over a white barn beside a Kansas road Weather Why does the sky turn green before a storm? A digital illustration of a starry space scene featuring a bright star and two large, shadowed celestial bodies resembling planets or moons. Pluto's Status Why is Pluto not a planet? A wide shot of the ancient stone monument Stonehenge under an overcast sky. Stonehenge Why is Stonehenge important?

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