NASA Found Something Under Pluto's Surface And It Shouldn't Be There

Added: 2026-06-01

[00:00:00]For most of human history, Pluto was just a dot.

[00:00:05]A pale speck at the frozen edge of the solar system, so small and so far away that even our best telescopes could barely resolve it into a shape.

[00:00:17]So, when NASA launched New Horizons in 2006, a spacecraft the size of a grand piano, and pointed it at Pluto for 9 years straight, scientists genuinely didn't know what they'd find.

[00:00:31]Most expected a dead cratered rock, boring, predictable, frozen solid for 4 and 1/2 billion years.

[00:00:41]They were wrong.

[00:00:43]Spectacularly wrong.

[00:00:46]Because when New Horizons finally arrived in July 2015, after traveling 3 billion miles, it revealed something that stopped scientists cold.

[00:00:57]Pluto wasn't dead.

[00:00:59]It wasn't simple.

[00:01:01]And most shockingly of all, something was happening beneath its surface.

[00:01:07]Something enormous.

[00:01:09]Something that by all rights should not exist.

[00:01:15]Let's start with what we actually know about Pluto, because this world is stranger than almost anything else in our solar system.

[00:01:24]Pluto sits nearly 4 billion miles from Earth, so far from the sun that sunlight over 5 hours just to reach it.

[00:01:34]Its surface temperature hovers around minus 230° C, Celsius, cold enough [music] to freeze nitrogen solid.

[00:01:44]For decades, the assumption was simple.

[00:01:47]Nothing interesting could survive out there.

[00:01:50]No internal heat, no geological activity, just a frozen ball drifting through the dark.

[00:01:59]New Horizons shattered that assumption in a matter of hours.

[00:02:03]The images coming back showed towering mountains of water ice, some reaching 3,500 m high, vast plains of flowing nitrogen glaciers, and then, a heart.

[00:02:20]A giant heart-shaped region the size of Texas carved into Pluto's surface, so bright it was visible from millions of miles away.

[00:02:31]Scientists named it Tombaugh Regio.

[00:02:34]But, what made it scientifically explosive wasn't its shape.

[00:02:39]It was what it implied about what lies beneath.

[00:02:43]Here is where things get deeply strange.

[00:02:47]That heart-shaped region sits inside a massive impact basin.

[00:02:53]And when scientists calculated its position relative to Pluto's largest moon, Charon, something didn't add up.

[00:03:02]The basin faces almost perfectly away from Charon.

[00:03:06]The odds of that being random, around 5%.

[00:03:12]The explanation scientists landed on is extraordinary.

[00:03:17]When an ancient asteroid struck and carved out that basin, something underground responded.

[00:03:24]Something liquid.

[00:03:26]A subsurface ocean welled up into the crater.

[00:03:30]Nitrogen ice condensed and froze on top.

[00:03:34]And the sheer weight of all that new material was so massive, it physically tilted Pluto, rotated the entire world until that basin locked into place.

[00:03:48]An underground ocean didn't just exist on Pluto.

[00:03:52]it was powerful enough to reorient the planet itself.

[00:03:57]Now, a liquid ocean on Pluto, that sounds impossible.

[00:04:04]And the first question anyone asks is, "How?"

[00:04:09]Pluto is tiny.

[00:04:12]A body that small should have lost all its internal heat billions of years ago, the same way a small cup of coffee cools faster than a full pot.

[00:04:23]Without heat, any subsurface water should have frozen solid long ago.

[00:04:29]But scientists at UC Santa Cruz found something unexpected buried in Pluto's geology.

[00:04:36]The cracks running across its surface don't show compression, the shrinking you'd expect from a world that cooled from the outside in.

[00:04:46]Instead, Pluto shows signs of expansion, as if something inside has been slowly pushing outward for billions of years.

[00:04:57]That evidence points to what researchers call a hot start.

[00:05:02]Pluto didn't form slowly and cool gradually.

[00:05:06]It formed violently, fast enough that the energy of all that colliding rock and ice generated enough heat to melt water immediately.

[00:05:17]Pluto was born with an ocean already inside it.

[00:05:22]And that ocean, scientists believe, has never fully frozen.

[00:05:28]Roughly 125 miles below the surface, kept liquid by residual heat, radioactive decay in the rocky core, and possibly dissolved ammonia acting as a natural antifreeze, a vast body of water has been sitting in complete darkness at the edge of the solar system for 4 and 1/2 billion years.

[00:05:53]To put that in perspective, that ocean was already old when the first complex life appeared on Earth.

[00:06:02]But the ocean isn't even the strangest part of this story.

[00:06:07]When New Horizons transmitted its full data set back to Earth, which took over a year because Pluto is that far away, scientists began examining the far side.

[00:06:19]The side of Pluto humanity had never seen.

[00:06:24]And there, directly opposite the heart-shaped basin, they found a shattered, broken landscape of ridges, cracks, and collapsed plains.

[00:06:35]Simulations showed this is almost certainly the result of shock waves from that same ancient asteroid impact traveling through a liquid interior and converging on the exact opposite side of the planet, shattering the crust from beneath.

[00:06:53]The ocean didn't just tilt Pluto, it conducted energy like a medium across the entire world, leaving its fingerprints on every side of this planet.

[00:07:04]And then there are the volcanoes.

[00:07:07]Near Pluto's South Pole, New Horizons photographed massive domes rising from the surface.

[00:07:14]One of them, called Wright Mons, is roughly the size of Hawaii's Mauna Loa.

[00:07:21]These aren't rock volcanoes, they're cryovolcanoes, structures that erupt not with magma, but with water, ice, and ammonia slush dredged up from deep below.

[00:07:33]The surface around them is geologically young, almost no craters, which in planetary science means the terrain has been actively resurfaced.

[00:07:44]Something underneath has been erupting recently on a world that should be completely frozen, that should be geologically dead.

[00:07:55]Something is still erupting.

[00:07:59]Scientists still don't fully understand what's powering it, which means either our models are wrong or Pluto has an energy source we haven't accounted for yet.

[00:08:12]Then, in 2025, the James Webb Space Telescope looked at Pluto and added one final layer to an already extraordinary story.

[00:08:23]When New Horizons flew past, it spotted a bluish haze glowing faintly above the surface, stretching more than 185 miles above Pluto, far higher and far more complex than anyone predicted.

[00:08:40]Scientists suspected this haze was doing something, but [music] couldn't prove it.

[00:08:46]Pluto's moon Charon kept contaminating the data.

[00:08:50]The two worlds are so close together in the sky that their signals blurred into one.

[00:08:57]JWST [music] changed that.

[00:09:00]Its infrared instruments were powerful enough to separate the two worlds for the first time.

[00:09:07]And what it found confirmed something [music] unprecedented.

[00:09:11]That haze isn't passive.

[00:09:13]>> [music] >> It's the engine of Pluto's entire climate, made of complex organic molecules formed when sunlight breaks down methane and nitrogen.

[00:09:25]The haze absorbs solar energy during the day and radiates it back into space at night.

[00:09:32]It functions as a thermostat, a self-regulating cooling system operating in the outer darkness of the solar system.

[00:09:42]The result, Pluto's upper atmosphere is running 30° C colder than our best models ever predicted.

[00:09:52]The scientist who led the study described it simply.

[00:09:56]This is a completely new type of climate.

[00:09:59]Nothing else in the solar system works this way.

[00:10:02]Not Earth, not Mars, not Jupiter.

[00:10:07]Pluto, the world we demoted, the world we dismissed, has a climate no one has ever seen before, anywhere.

[00:10:18]We have never landed on Pluto, never sampled its ice, never looked directly beneath its surface.

[00:10:27]Everything we know >> [music] >> comes from one spacecraft that flew past for a matter of hours, and a telescope pointing from 4 billion miles away.

[00:10:38]There is a proposed mission that would change that.

[00:10:42]A Pluto orbiter designed to enter orbit, map the surface in full, and begin answering the questions New Horizons could only raise.

[00:10:53]Scientists have described what it could return as phenomenal.

[00:10:58]But it hasn't launched. It hasn't been funded.

[00:11:03]And until it does, Pluto [music] keeps its secrets.