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Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
Curiosities,Creepy WorldAUG 25, 2025

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of

Monika Pašukonytė
Rutuja Dumbre
Monika Pašukonytė and Rutuja Dumbre
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The concept of space is so intriguing that it fascinated our ancestors, and to this day, humans have been trying to figure out the big mysteries that it possesses. Even with all the technology that we have, we barely know anything about it.
However, what we do know for sure is that it’s scary as hell, literally! From black holes to monster moons, space comprises so many disturbing things that our brains won’t even be able to digest a few of them. If it still fascinates you, then scroll down to check out some terrifying facts about it that netizens have shared!

#1

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
Time is not linear due to the constant expansion of space therefore time is expansive.

Phytanic replied:

also time is a function of gravity. the earths core is ~2.5 years younger than the crust

Velocity_Rob replied:

I can relate to that. I feel like my core is still only 28 but my crust is definitely 40.
Argybargyass, ahmadzada
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40points

#2

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
That the universe is expanding, but not into anything. Space itself is stretching, and there’s no edge, no center, no “outside.” It’s not just vast, it’s fundamentally beyond how our brains are wired to understand reality.
TheLegitimateGoose
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38points

#3

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
Terrifying? Maybe not terrifying…but the fact that all the stupid stuff we are doing to earth and each others doesn’t mean squat in the grand sense of things. Our earth could suddenly be destroyed by so many things in so many ways by some extraterrestrial event….and it won’t matter, we won’t matter. This is all we’ve got and we’re making a right mess of it all.
IronRakkasan11, freepik
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37points

I literally had goosebumps when I was scrolling through the list because some of these facts are so destructive, it honestly put me in an existential crisis. Now you might wonder why that happens, but the truth is that the universe is something completely unknown. While science continues to push the boundaries of our understanding, the deeper we delve, the more we uncover how little we truly grasp.

It has been observed that humans thrive on sameness, repetition, and ritual, but fear the unknown, the unfamiliar, the uncertain. When confronted with facts that challenge our perception of reality or highlight the fragile nature of our existence, it’s only natural to feel disturbed, isn't it? After all, we are trying to find order and meaning in a universe that offers neither!

#4

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
If we are truly alone in the universe and mankind wipes itself out, the universe will continue to exist without any life, no one to comprehend the universe. That seems sad and scary.

If we are not alone, then that is an equally scary prospect.
northernbloke, EyeEm
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34points

#5

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
There are voids in the universe that are so big that if you were teleported to the center with a spacesuit on, you would just see pitch darkness in all directions.

EDIT: Whoah. This blew up quickly. Thank you for the silver! EDIT: And the Wholesome! And the Helpful!
Ronald_Deuce, freepik
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30points

#6

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
It's a big bunch of stuff zipping around with no regard for us and there's almost nothing we can do to influence it.

A giant rock could be flung into our planet and wipe out all life, and the universe would go on without a blip. We don't matter in the least.
NetDork, tawatchai07
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29points

As wild and unsettling as some of these things might sound, just imagine actually seeing them in person. Being an astronaut might seem like the ultimate dream job, and in many ways, it is, but the reality of going to space is way more intense than most of us realize.

In fact, research suggests that space travel can take a heavy toll on astronauts, ranging from positive effects like ‘the overview effect’ to negative effects such as sleep deprivation, anxiety and depression. The overview effect is when astronauts see Earth from space and get this deep, almost spiritual sense of how fragile Earth is, and how they are connected to it.

#7

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
On a grand scale, everything is getting further and further apart. Stars will one day disappear from the sky.
sunbearimon, freepik
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27points

#8

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
The sun is unbearably loud. All stars are very loud.

Enough_Estimate7141 replied:

This is a stunning thought.
anon
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26points

#9

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
How incomprehensively large the universe is.

UrdnotZigrin replied:

There are about 400 billion stars in our galaxy, with an average of slightly more than one planet per star. That means that within our galaxy, there are over 400 billion opportunities for life to have evolved. This isn't even counting all of the moons, comets, asteroids, etc. within our solar system, or even the idea that life could evolve twice on the same world.
On top of that, we live in a pretty average-sized galaxy that is one of over two trillion galaxies estimated to be within the observable universe. Given that the Cosmological Principle essentially says that space is the same in all directions, that would mean an average of over 400 billion chances for life to appear, 2 TRILLION times.
There is life elsewhere in this universe. No matter how rare the existence of life is, even if it's a 1 in a trillion chance, that's still more than 800 trillion chance of life appearing.
Routine_Mine_3019, wahyu_t
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24points

While something like the overview effect might seduce you, let's not forget that the astronauts are in an environment where day and night don’t exist in the usual way, are cut off from family and normal life, and know they're floating in a vacuum. It can be a lot to take in, so while space travel is incredible, it's also incredibly challenging on a human level.

Strange is it not that despite knowing all the dread that space has in it, we still just can't stop thinking about it, learning about it and knowing about it? There’s probably something in us, some deep, restless curiosity, that makes us keep reaching out.

We build bigger and better telescopes to see farther. We launch robots and satellites to explore planets we’ll probably never walk on. We send things into the void, just in case someone, or something, is out there listening. Humanity just keeps trying!

#10

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
The sheer size of everything. There is a black hole called TON 618 that has a diameter 30 to 40 billion times our solar system with a mass of 40 billion suns.
psycharious, freepik
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22points

#11

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
Astronomer here! There are a lot of things posted here that are not really likely to happen any time soon or affect your life on Earth much. So, if you want something to worry about, may I introduce you to the Carrington Event of 1859. Basically Carrington was a scientist who noticed a flash from a huge cluster of sunspots, which was the biggest coronal mass ejection from the sun ever recorded (aka a ton of material ejected from the sun at high speeds). It hit Earth within a day- aurora were seen as far south as Hawaii, wires on telephone poles burst into flame, and telegraph operators even reported contacting each other *when not connected*. If a similar event were to strike Earth today, it would cause billions of dollars in damage, because blown transformers are super hard to replace and a lot of satellites wouldn’t be able to handle it (and it goes without saying you’d have a serious radio blackout for a bit until it ended on a ton of essential frequencies).

The crazy thing about the Carrington event though is we really have no idea how often such events happen. But we do know that in 2012 there *was* a Carrington-level solar flare that barely missed Earth...

Edit: for those making “next in 2020” jokes, this is not super likely this year. We do know these biggest flares happen during solar maximum- the sun has an 11 year cycle of sunspots and the period with the most is solar maximum. We are just coming out of a minimum so the next max would be 2025-2026 or so.

However we really don’t know how common these big flares are. Interestingly data from other stars shows they seem to be much more common around other stars than our own, with huge implications for life in some cases.

Edit 2: apparently this was on a YouTube channel this week coincidentally, you don’t need to be the 100th person chiming in to mention it.
Andromeda321, vecstock
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19points

#12

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
You'll never set foot on another planet, and humans are unlikely to ever set foot in another system at all.

Hell, it would take even the Voyager craft 83,500 years to reach the next nearest star and that left in the 1970's and is already nearly dead.

Chances are, humans will die as a species on Earth, but certainly without ever having seen any other system.
ledow, freepik
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18points

I don't think space will ever stop fascinating humans. In fact, did you know that experts have compared the universe to our brains? That's right! Crazy as it sounds, our brains and the universe actually have a lot in common.

Even though they're totally different in size, scientists have found some surprising similarities in how they’re structured. Both are made up of huge, complex networks, the brain with around 69 billion neurons, and the universe with over 100 billion galaxies. In both cases, those pieces connect in long filaments and clusters, kind of like a giant cosmic spiderweb.

However, what's more cool is that about 30% of each system is made up of the active stuff, neurons in the brain, galaxies in space. The other 70% is kind of mysterious. In your brain, it's water, and in the universe, it's dark energy, and we’re still figuring out what that means!

#13

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
If we built a ship, and some portion of the population left in it to explore like Star Trek, we would never see those people again.

llathosv2 replied:

Nobody seems to appreciate that your point is about relativity.
Mean_Jury2467, freepik
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17points

#14

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
That we, as a planet, are literally flying through Space.

I dont just mean around the Sun, because our Solar System is flying through space as well.

Along with our Galaxy too. Where Earth was one minute ago is a point in space that we will never return too.
from_the_east, freepik
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17points

#15

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
The fact that Voyager 2 Space probe after over 40 years has not even hit a pebble.....

disgruntled-capybara replied:

I find the Voyager probes to be fascinating, especially because last I knew, Voyager 2 is still functioning and sending back a limited amount of data. But even the whole mission--suddenly bringing all these worlds into sharp focus that had never been seen up close before. All the questions answered and places explored. And there it is, still floating along and talking to us. For now.
melekh88, NASA/JPL
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17points

Well folks, that's it from our end, and now we leave you to enjoy the rest of the terrifying thread. I hope that you don't get as caught up in it as I did and end up with an existential crisis! Also, if you know any other such bone-chilling space facts, don't let them float in the dark void, but share them with us in the comments below!

#16

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
The number of theories as to why, if intelligent life besides humanity exists, it hasn't contacted us on a large scale yet. To wit, some of them are:


1.We lack the capacity for interstellar communication

2. Earth is essentially a space backwater, and that humans are so relatively primitive that alien life has decided it's better to leave us alone, like a nature preserve

3. The same, except the aliens are afraid of our savagery relative to theirs

4. There is no (intelligent) life besides ours

5. We have been in contact, but cannot perceive said beings

6. Extraterrestrials are too distant to be contacted.
FlyingDreamWhale67, kjpargeter
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16points

#17

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
It’s not actually empty and every time astronauts go outside of the space station they risk pieces of debris flying through their bodies like bullets.
AnotherBogCryptid, Andrei Armiagov
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16points

#18

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
No one can hear you scream.

Relevant_Maybe_9291 asked:

Does this all mean if something exploded in space like a missile or a ship it doesn’t make a sound?

theObfuscator replied:

Yes and no. Sound needs a medium to travel through. Conventional explosives are nothing more than extremely rapidly expanding gas and heat. If you were close enough to an explosion in space for this expanding gas to impact you, you would feel and “hear” it. If you were far enough away to see it but not have the explosion itself reach you, the sound cannot move through the vacuum that exists between you and the edge of the explosion’s influence.
so_dope24, EyeEm
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16points

#19

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
I can't accept the fact that there is no end in space. But if there is indeed an end, then... what's beyond it?

I'm stucked in absurdity.

Edit: In the numerous answers I've received, the one that seems to come back the most is "the universe is curved, you would end up back where you started". Seems fair enough. Then again,that wouldn't mean there is no limit. On the contrary, that would just mean we are trapped in (or on the surface of) a sphere, but there is still a limit to this sphere. So the question remains... what's beyond it?
Tartokwetsh, ArtPhoto_studio
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16points

#20

Here's An Ultimate Hotlist Of 34 Terrifying Facts About The Universe Folks Are Unaware Of
There are things out there that could k**l you before you can conceive of your own demise. Fun ones are a gamma ray burst pointed straight at Earth or a false vacuum decay!!

You’ll either be melted or turned into non existence!!
OSUfirebird18, freepik
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14points
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