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811.
Saturn’s rings are mostly made of water ice, and they’re slowly raining down into the planet at a rate that means they’ll be gone in roughly 100 million years — which sounds geologically long, but in the timeline of the solar system it means we’re seeing them during one specific moment of their existence, and almost any other moment we could have been born into would have seen Saturn without them
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▲ 0 · May 18
812.
The Chernobyl exclusion zone is now one of the largest wildlife sanctuaries in Europe, revealing a grim paradox: removing humans from the landscape did far more for the animals than a nuclear disaster did to harm them
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▲ 0 · May 18
813.
China installed more solar capacity in 2023 than the United States has installed in its entire history, and the panels were largely manufactured using coal-fired electricity
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▲ 0 · May 18
814.
Humans share roughly 60 percent of our genes with a banana — and the framing makes for good party trivia, but the more interesting fact is what it actually means: that nearly all the basic machinery for being a living thing was settled long before our lineage and the banana’s parted ways, and most of what makes any of us recognizable is the small remaining percentage we don’t share.
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▲ 0 · May 18
815.
The ozone layer is the only major environmental crisis humanity has actually solved, and it happened because the chemical industry quietly realised the replacement refrigerants were more profitable than the ones being banned
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▲ 0 · May 18
816.
The Voyager probes carry golden records etched with greetings in 55 languages, whale songs, and a woman’s brainwaves recorded while she thought about being in love, and the records are designed to remain playable for one billion years drifting through interstellar space.
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▲ 0 · May 18
817.
The Soviet naval officer who refused to fire his nuclear torpedo during the Cuban Missile Crisis is the reason most people alive today exist — and almost no one in the West knew his name until 2002
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▲ 0 · May 18
818.
A quantum flicker measured in centimeters and nanoseconds may be the hidden switch deciding whether a dying star explodes into a supernova or simply collapses in silence
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▲ 0 · May 18
819.
The Cassini spacecraft was deliberately flown into Saturn in 2017 because its fuel was running low and engineers refused to risk it drifting into Enceladus, a moon with a subsurface ocean, and the final 22 orbits were designed to thread a 1,500-mile gap between Saturn and its innermost ring that no spacecraft had ever attempted.
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▲ 0 · May 18
820.
Psychology suggests people who sleep in the same bed as their pets often carry a quiet recognition most adults postpone — that the relationships that work most reliably don’t require us to be anyone other than who we are, and an animal who asks for nothing more is the most consistent reminder of that
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▲ 0 · May 18
821.
Nobody tells you that the most important relationship you’ll have in midlife is the one with the version of yourself you were 25 — and the work of going back, apologizing to her, and thanking her for getting you here is something the rest of your adult life is going to be quietly built around
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▲ 0 · May 18
822.
There’s a particular freedom that arrives the first time you say no to something you would have said yes to a decade ago — and the freedom isn’t from the no itself, it’s from the realization that the yes was costing you something you finally have the language to name
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▲ 0 · May 18
823.
For the first time in human history, most people live under skies they cannot see — and the psychological consequence of having lost the night sky has barely begun to be measured.
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▲ 0 · May 18
824.
There’s a particular kind of peace that arrives in your 60s and 70s when you finally stop trying to be understood by people who haven’t been listening — and the peace isn’t sad, it’s the structural truth of someone who has stopped negotiating with audiences that weren’t going to give her what she was asking for
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▲ 0 · May 18
825.
The Apollo Guidance Computer that landed humans on the Moon had less processing power than a modern microwave, and the engineers programmed it with rope memory that was hand-woven by women who were called “Little Old Ladies” in the official documentation — and the entire system worked because they were never wrong
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▲ 0 · May 18
826.
SpaceX has launched more rockets in the past four years than the Soviet Union launched during the entire Space Race, and the cost per kilogram to low Earth orbit has dropped about 95% since 2010 — which has quietly rewritten the economics of every space program on the planet without most of the public quite registering it.
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▲ 0 · May 18
827.
The James Webb Space Telescope is parked a million miles from Earth at a gravitational sweet spot called L2, and the only way to refuel or service it is to send another spacecraft on a one-way mission that hasn’t been designed yet, which means every photograph it takes for the rest of its life is being captured by an instrument we’ve already accepted we can’t save
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▲ 0 · May 18
828.
NASA still maintains some of the Voyager spacecraft code from the 70s era
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▲ 101 · May 18 · 103 comments on HN
829.
The Voyager Golden Record was pressed in 1977 with greetings in 55 languages and a sample of human music ranging from Beethoven to Chuck Berry — and the engineers who chose what to include had six weeks to decide what humanity wanted to say to whoever might eventually find it
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▲ 0 · May 18
830.
What astronauts actually eat for six months in space — and why almost none of it would survive a single meal in your kitchen without engineering, weight calculations, and a tortilla
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▲ 0 · May 18
831.
The four astronauts who flew farther from Earth than any humans in history have just come back. The advice they’re giving the rest of us has almost nothing to do with space.
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▲ 0 · May 18