- 7 weeks ago
Astronomers just spotted something strange far beyond Neptune, and it lines up perfectly with Planet 9 theories. The way distant objects move out there doesn’t make sense unless something big is pulling on them. This isn’t one clue, it’s a pattern scientists can’t ignore anymore. If Planet 9 exists, it could rewrite how we understand our solar system. Watch this video to see what was found and why this evidence matters right now. Animation is created by Bright Side.
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This video is made for entertainment purposes. We do not make any warranties about the completeness, safety and reliability. Any action you take upon the information in this video is strictly at your own risk, and we will not be liable for any damages or losses. It is the viewer's responsibility to use judgement, care and precaution if you plan to replicate.
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00:00Now, if Earth were the size of a nickel, Neptune would be about as big as a baseball.
00:06That's impressive, but it's nothing compared to the giant 9th planet that might be hiding out there.
00:12Now, our Planet 9's discovery saga might have finally come to an end.
00:16Turns out, the problem wasn't where we were looking, but how.
00:20And researchers might have just made the biggest solar system discovery in decades.
00:25You see, the idea of finding a planet beyond Neptune has been around for years now.
00:30I know, back in school, you probably learned that the 9th planet was Pluto.
00:35But forget about Pluto, it's been demoted to a less fancy category since 2006.
00:41What I'm talking about is the Planet 9.
00:44A hypothetical giant planet that could be our cosmic neighbor.
00:48We've never actually seen it, but scientists are pretty sure it's out there somewhere,
00:53hiding in the outer solar system.
00:56To explain why they think that, we need a sheet of paper.
00:59Hey, here's one.
01:00We place a coin on it, and suddenly, it starts to move.
01:04Unless we're talking about some kind of superpower, there's no way this coin is moving on its own, right?
01:10So, you figure someone must be on the other side, holding a magnet and moving it around.
01:16You can't see the magnet, but it explains why the coin is moving.
01:20That's kind of what's happening with Planet 9.
01:23We can't see it, we can't prove it, yet.
01:26But its existence could explain the strange movements we see out there in space.
01:31For example, the planets in our solar system orbit on a flat plane that's tilted about 6 degrees relative to the Sun.
01:39But why 6 degrees?
01:41Well, no one really knows for sure.
01:43Some scientists think those orbits might be slightly tilted because of the pull of a 9th planet.
01:48Its existence could also explain the unusual paths of smaller objects in the distant Kuiper Belt, a region full of icy debris that stretches far beyond Neptune's orbit.
02:00Back in 2016, researchers from Caltech published a study about Planet 9.
02:06They suggested it could have a mass about 10 times that of Earth and follow a highly elongated path.
02:13It's a scientific way of saying it takes forever to make one trip around the Sun.
02:17Because of that, it would be located in the outer solar system.
02:21I mean, far, far away.
02:23It would orbit the Sun about 20 to 30 times farther out than our most distant planet, Neptune.
02:30According to scientists, Planet 9 would take up to 20,000 Earth years to complete just one full orbit around the Sun.
02:37Since it's crazy far out there, it's almost impossible to see it.
02:41So, as cool as this hypothesis sounds, we've never found solid evidence that Planet 9 actually exists.
02:49But we might be pretty close.
02:51In May 2025, a team at National Tsinghua University might have made one of the most exciting solar system discoveries ever.
03:00Alright, so there's a hypothesis that Planet 9 hasn't been discovered yet because we haven't been using the right method.
03:07This new study raises an interesting question.
03:10What if Planet 9 actually looks brighter in infrared light than it does in visible light?
03:16Let me explain.
03:17Scientists have been trying to spot Planet 9 by its reflected light.
03:21But here's the problem.
03:23The spotted invisible wavelengths, sunlight, would have to travel all the way out to Planet 9, bounce off its surface, and then travel all the way back to Earth.
03:32If a Neptune-sized planet were about 10 times farther away than Neptune, it would look about 10,000 times fainter.
03:40But a planet's own thermal radiation, I mean, its heat, only has to make a one-way trip.
03:46So, in infrared light, Planet 9 would only be about 100 times fainter.
03:51That's why it makes more sense to look for it using space-based infrared telescopes.
03:56And that's the idea behind this new study.
03:58The team started digging through archives, searching for old infrared sky survey data.
04:04And they pulled it from two main sources.
04:06First, IRIS.
04:08The satellite launched in the 80s that scanned the sky for almost a year.
04:12Then, the Japanese satellite Akari.
04:14Another infrared observatory that operated between 2006 and 2011.
04:19So, basically, they compared objects that showed up in IRIS database and noticed which ones had moved by the time Akari took its observations.
04:29And by doing that, the researchers found something incredible.
04:33An object that might just be our long-lost ninth planet.
04:37Because if something moves, it could be a planet orbiting the Sun, right?
04:42And yeah, they did find some celestial objects showing tiny movements.
04:46But before jumping to conclusions, they had to rule out the parallax effect.
04:51And that's something really important when we're talking about solar system discoveries.
04:55To explain it, I need you to do something.
04:58Hold one finger in front of your face.
05:00Close one eye.
05:02And now switch.
05:03Your finger seems to move a tiny bit, right?
05:05That's because you're looking at it from a slightly different angle.
05:09From one eyeball to the other.
05:11The same thing happens when we look out into space from Earth.
05:14Since our planet orbits the Sun, our view of very distant objects shifts just a little.
05:21That effect is called parallax.
05:23My point is, because of this effect, planet 9 would appear to move across the sky as Earth goes around the Sun.
05:30On any given day, it might seem to be in one spot.
05:33But six months later, when Earth is on the opposite side of the Sun, it would look like it shifted.
05:39Six months after that, it would seem to move back again.
05:42Scientists had to account for parallax.
05:45Actually, they had to remove its effects.
05:48So the team looked at images of the sky taken on the same date every year.
05:53Because on that same date, Earth is always in the same spot in its orbit.
05:57That means if planet 9 is real, it would show up in the same place in those images every year.
06:03No fake wiggle from parallax.
06:05It's just its real position.
06:08This careful search led them to a single object.
06:11A tiny dot in the infrared data.
06:14This strange little spot had moved slightly along its orbit around the Sun over the 23 years between Iris and Icari.
06:21Wait, could that be it?
06:23Did astronomers just confirm a hidden planet?
06:26Well, maybe.
06:28But don't get too excited.
06:30The data we have on its motion over that time is not enough to figure out its full orbit.
06:36So, for now, we still can't say for sure if this mysterious object is really planet 9.
06:42It's definitely a strong candidate, though.
06:45Based on how bright the object appears, the team estimates it could be pretty massive.
06:50And that came as a big surprise.
06:52You see, previous NASA research ruled out any Jupiter-sized or Saturn-sized planets hiding out there.
06:59But a smaller world would have gone undetected.
07:02So, the scientists were looking for something just a bit bigger than Earth.
07:06But it turns out, this mysterious planet might be more massive than Neptune.
07:11Now that they've discovered planet 9, supposedly, at least,
07:14the plan is to keep tracking it and collecting new data.
07:18But don't think the road ahead will be easy.
07:20Because since the Akari satellite spotted it for the first time,
07:24that object didn't just sit still.
07:26It's been moving slowly through space ever since.
07:29So now, scientists need to use regular telescopes on Earth to look for it again.
07:34And here's the tricky part.
07:36They're not exactly sure where it moved to.
07:39So, they have to search a pretty big patch of the sky.
07:42And so far, no matching object has been found.
07:46Whether this really turns out to be the planet 9 discovery or not,
07:49only time will tell.
07:51For now, its existence is still up for debate.
07:54But with powerful new technology on the way,
07:57like NASA's Nancy Grace Roman Space Telescope,
08:00astronomers are more determined than ever to uncover the truth.
08:04And if planet 9 really is out there,
08:07hiding in the cold, dark edges of our solar system,
08:10it's running out of places to hide.
08:12Wow, scientists just discovered a deep space fossil.
08:18And no, it's not a dinosaur.
08:20It's called ammonite,
08:22a strange icy object that's been quietly orbiting far beyond Pluto
08:26for over 4 billion years.
08:29Now, this frozen relic might flip everything we thought we knew about the solar system.
08:33And that's because it could be the strongest evidence yet
08:37that planet 9, the mysterious world we've been chasing for years,
08:41doesn't exist at all.
08:43Now, before we get into it,
08:45meet ammonite, the newest member of our solar system.
08:48It isn't a planet.
08:50It's not even a dwarf planet like Pluto.
08:52You know, something in space that's big enough to be round,
08:55but too small to push other objects out of the way.
08:58Ammonite's even smaller than that.
09:00It's believed that its diameter is roughly 40 times the height of Mount Everest.
09:06And before you say, wait, that's not small.
09:09Remember, in planetary terms, that's basically nothing.
09:12Earth, for example, is 30 times larger than that.
09:16Anyway, they officially nicknamed it 2023 KQ14.
09:21Inspiring, huh?
09:22But people just call it ammonite.
09:25The nickname comes from ancient sea creatures with spiral shells,
09:28just like the ones you might find on the beach.
09:31But this little space object doesn't actually look like a spiral or anything.
09:36The name is inspired by the way it moves.
09:39And its orbit is unlike anything else out there.
09:42In fact, it suggests that the outer solar system
09:44is way more complex and varied than we used to think.
09:48There are two big reasons for that.
09:51First, ammonite's been on this path
09:53pretty much since the solar system first formed.
09:56Yeah, that long.
09:57And because it's been around since the very beginning,
10:00it's considered a space fossil.
10:02Okay, no jokes about the narrator.
10:05The second reason is its orbit.
10:07It's oval and massive, like a huge circle that's been pulled wide.
10:12Picture a perfectly round Formula One track.
10:15Cars race around it in no time.
10:17Now, stretch that track into an oval format
10:20and make it 432 times longer.
10:23Suddenly, each lap feels endless, right?
10:25Well, that's kind of what's happening with ammonite.
10:29Its orbit is so stretched out
10:30that it takes about 4,000 Earth years
10:33to make just one trip around the Sun.
10:36And that's why it's super far from us.
10:39Okay, quick recap.
10:40Here's what we know about ammonite so far.
10:43One, it's super distant.
10:45Two, it has this weird stretched-out orbit that looks oval.
10:48And it's exactly those two things
10:51that led scientists to classify it as a sedenoid.
10:55These space objects are so rare
10:56that we only know about three of them.
10:59And now, 2023 KQ14 is the fourth.
11:04So, sedenoids.
11:06They are super far away.
11:08So far, in fact, that Neptune's gravity hardly affects them.
11:11And honestly, they don't make much sense to us
11:14because their paths are nothing like the rest of the solar system.
11:17Look, here's how Earth, Mars, and the other planets move around the Sun.
11:22Their paths aren't perfect circles,
11:24but their orbits are almost round.
11:26All right, let's zoom out.
11:28More, more, more, more, stop.
11:31Now, this is how sedenoids move.
11:34See how their paths look totally different
11:36from the rest of the solar system?
11:38They seem more random and are shaped like squashed circles.
11:42Sedenoids are also super cool.
11:44And I mean literally cool, as in freezing cold,
11:48since they're so far from the Sun.
11:50But also cool, as in mysterious and awesome,
11:54because they might be hiding clues about the existence of Planet 9.
11:58So, you've probably heard about this theory, right?
12:01Many experts seriously believe there could be a hidden 9th planet
12:05out at the edge of our solar system.
12:07In theory, it's this dark gas or ice giant,
12:12somewhere between 5 and 10 times the mass of Earth.
12:15It's believed to orbit the Sun on a highly stretched-out path
12:19that's totally out of sync with the rest of the planets.
12:22But we've never actually seen it or proven it.
12:26Experts just think it's out there,
12:28because it would explain a bunch of weird stuff
12:30happening way out on the edges of the solar system,
12:32like the wild, tilted orbits of sedenoids.
12:36In other words, those bizarre paths
12:38might be caused by the gravitational pull
12:40of this so-called unseen Planet 9.
12:44Now, here's the thing about Ammonite.
12:46Its orbit is different from its cosmic cousins.
12:51Let's take a look.
12:52These are the orbits of the other three sedenoids we know about.
12:55See how they all sort of cluster
12:57in the same general region of space?
12:59Like they're all being pulled in roughly the same direction?
13:03This suggests that something unusual
13:05happened way back in the early days of the solar system.
13:09And that pattern is a big part of what made scientists suspect
13:12the existence of Planet 9 in the first place.
13:15I mean, there's gotta be something out there
13:17influencing their paths.
13:19But things get even weirder when we look at Ammonite's orbit,
13:23because its path doesn't line up at all
13:25with the other three sedenoids.
13:26In fact, it's actually pointing in the opposite direction.
13:30And that might mean just one thing.
13:33We might have to say goodbye to Planet 9 for good.
13:37Or maybe we've just discovered that it's actually a ghost planet.
13:41You know, like the ghost of someone who once lived on Earth,
13:45but isn't here anymore?
13:46Somehow, traces of them still linger,
13:49like in a haunted house,
13:50where something keeps moving stuff around in the kitchen cabinet.
13:53Well, Planet 9 might be just like that,
13:57not only in space.
14:00It might have existed a long, long time ago.
14:04But at some point,
14:05for reasons we don't fully understand,
14:07it vanished.
14:08Maybe it even got kicked out of the solar system.
14:11But its old gravitational pull could still be with us,
14:15hunting Ammonite,
14:16giving it a little push.
14:18But now, we can't see it anymore.
14:21Of course, there's still a chance that its strange orbit
14:24is caused by something entirely different.
14:26Some believe it might be the result of an interaction with a rogue planet.
14:31And by that, I mean a planet-sized object that doesn't orbit a star.
14:35Or the influence might even come from stars that passed by a long time ago,
14:40back when the Sun was still young.
14:41But, let's be honest,
14:44no other theory is as intriguing
14:46as the existence of a massive, hidden planet.
14:50Big question.
14:52Could Planet 9 still exist after this discovery?
14:55Well, yeah.
14:57But it would have to be much farther out
14:59than scientists originally predicted.
15:01Because even though people believe
15:03it might be the fifth-largest planet in the solar system,
15:06there's still a massive area out there
15:08where it could be hiding.
15:09Before, scientists thought Planet 9
15:12was about 400 times farther from the Sun than the Earth.
15:16That's also around 13 times farther out than Neptune.
15:19If we launched a spacecraft today to go find it,
15:22it would probably take somewhere between 45 and 75 years to get there.
15:28And now, with the Ammonite theory coming to light,
15:31that distance might be even greater.
15:33We just don't know how much farther it could be.
15:36Because, like I said, Planet 9 is still just a theory.
15:40It's more of a cool space legend at this point.
15:43But Ammonite is completely different.
15:46It's real.
15:47And it goes far beyond simply adding
15:49one more distant object to our planetary neighborhood.
15:52It's helping astronomers piece together
15:54what the early solar system might have looked like.
15:57Studying the evolution of its orbit
16:00and its physical characteristics
16:01is the key to getting closer to the truth.
16:04Because, the reality is,
16:06there's still so much we haven't explored.
16:09Spacecraft have only reached a tiny fraction of what's out there.
16:13Most of the outer regions remain completely unexplored.
16:17Thankfully, we have tools like the Subaru Telescope,
16:20the same one that spotted Ammonite.
16:21According to experts,
16:23it's one of the few telescopes on Earth
16:25capable of finding objects this remote.
16:28So now, we just have to hope
16:30more discoveries like this keep coming.
16:32And if we've just found Ammonite,
16:35what else could be hiding out there in the dark,
16:38waiting for us to find it?
16:39Any guesses?
16:40That's it for today.
16:45So hey, if you pacified your curiosity,
16:47then give the video a like
16:49and share it with your friends.
16:50Or if you want more,
16:51just click on these videos
16:52and stay on the bright side.
16:54And the moment we have chinched.
16:56Let's pray.
16:59Let's see.
16:59Let's see.
17:02Let's see.
17:05Let's get up.
17:13Let's get up.
17:17Let's see.
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