Astronauts left something on the moon that could help unlock the origins of life itself.

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An accidental discovery on a nighttime walk led one scientist and his team to wonder: How many mammals glow under ultraviolet light? The list keeps growing, but scientists still aren’t sure why these furry creatures glow.

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In the early 1900s, Henrietta Leavitt made one of the most important discoveries in the history of astronomy: a yardstick to measure distances to faraway stars. Using this tool, scientists eventually transformed our understanding of the universe. They realized space was expanding, that this expansion was accelerating, and that ultimately, everything will end.

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As part of a massive new global tracking project, scientists are monitoring animals from a receiver on the International Space Station, mapping the incredible, previously unknown journeys that animals undertake. They’re beginning to tackle questions like how far do animals actually move? And how in the world do they know where they’re going?

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These worms are fast, they’re mysterious, and they’re quickly changing North American ecosystems. How worried should we be about global worming?

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How tall is the world’s tallest mountain? The answer is surprisingly tricky, which means that Everest’s official height is constantly changing. In fact, depending on the type of measurement scientists use, Everest may not be the tallest mountain in the world.

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UFOs are real, but that doesn’t mean they’re aliens. Today, Explained, Vox's daily news podcast, tells the story of America's longstanding relationship with UFOs and what we might learn from an upcoming government report.

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Something strange is going on at the outer reaches of the solar system. One astronomer thinks it might be a Neptune-sized ninth planet, and he’s on a quest to find it.

That search is happening at an enormous telescope on the summit of Maunakea, a dormant Hawaiian volcano with a long astronomical and cultural history. But many Native Hawaiian scientists are asking: What’s lost in the pursuit of larger and larger telescopes?

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It’s surprisingly hard to predict how clouds form, move, and change, but it’s essential to try. Because how clouds react to a warming world helps determine how hot our future will be.

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Last month, physicists at Fermilab in Illinois found that tiny subatomic particles called muons were wobbling strangely. This small observation could transform the future of particle physics, potentially pointing toward undiscovered particles or maybe even a new force of nature.

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