Slow-motion Moon-Earth collision (SPH simulation)

Detailed simulation of the Moon colliding with the Earth at 10 km/s. The simulation contains about 10 million particles.
Computed with OpenSPH
pavelsevecek.g...
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[@NorDank]

This would have severe negative impacts on the European economy

[@onrch]

Perhaps the UK aswell, even though it left the EU

[@Peppermynt.]

Yeah, fishing season might also have to be canceled cause of that.

[@chairlovawitabat]

On the other hand, the net effect of the impact on the North Korean economy is quite negligible.

[@Pabloparsil]

Source?

[@pedro_H3.0]

Bruh💀

[@kellanfeng]

I like how the moon is elongated due to the gravitational pull

[@MarcoMa210]

Still no roche limit

[@tornadicstorm2866]

@@MarcoMa210 Doesn’t that happen when its orbiting not head on?

[@gamertardguardian1299]

@@tornadicstorm2866 Yes

[@v2talk]

This is incorrect representation, Moon will get obliterated into chunks of rocks once it cross the Roche limit. The Moon if it hits Earth will not hit intact like that, it will be hitting in serveral pieces. Of course Earth also would also get elongated and obliterated due to huge tides on the side of Moon's approach, even before the Moon hits

[@tornadicstorm2866]

@@v2talk Thought that only happened in orbit or when passing by and not going head on but I could be wrong.

[@Nl0m]

I love how moon was egg shaped cuz of roche limit but not earth (prabably massive tidal waves

[@ingunnbollestad]

thanks man, i was wondering the egg shape.

[@Edvit40]

@@ingunnbollestad it is roche limit and it is earth

[@ThrowableCube]

GD Reference? (this is a joke please don't kill me)

[@Edvit40]

@@ThrowableCube imma bring you to the slaugh terhouse

[@Edvit40]

@@ThrowableCube imma bring you to the slo ter house (KZbin STOP DELETING THE COMMENT)

[@vanjakloz362]

pavel ovo je pre kul nemogu verovat kolko je dobro

[@SuperS05]

If you could pick where to view this from.... I think right in front of the initial blast wave. Maybe somewhere in north Africa in this case. A 1000 km high broiling fire wall racing at you after seeing the moon fall. The end is quick and you aren't dodging debris along with the wave.

[@kinoko384]

I see, Thanos is trying a different approach this time

[@CUBOSH]

basically all solids are still just liquid

[@Mycatkeepstryingtodestroymybed]

Yes but no well in largescale it isn't as tightly bond than you would think it is its not like the rock you would find in the dirt or that you bought earth is more like a ton of tiny particles bonded by gravity and the magma inside is basically the same thing but even more liquidly.

[@petterlarsson7257]

@@Mycatkeepstryingtodestroymybed what

[@Mycatkeepstryingtodestroymybed]

@@petterlarsson7257 im just saying its kinda like a lavacake pick one apart thatll help

[@petterlarsson7257]

@@Mycatkeepstryingtodestroymybed I meant like what are you saying I can't understand you with that grammar

[@Mycatkeepstryingtodestroymybed]

@@petterlarsson7257 oh yea looking back on it I dont think having so little sleep would do well

[@mikip3242]

This is still a bit faster than real time, right? It looks faster than 10 km/sec

[@personzorz]

Maybe the Kaylarians threw the moon really fast

[@sayochikun3288]

@@personzorz the earth reshapes very fast too

[@petterlarsson7257]

@@sayochikun3288 its supposed to

[@neoqueto]

Is there a friction component to your blackbody radiation code? I'm asking because I thought the Moon would start to glow red as it deforms just before the collision

[@petterlarsson7257]

It wouldn't because it didnt have enough time to get pulled apart enough to reach the draper point

[@Kitrinos_Real]

The Draper point is when an object starts to glow a dim red at 798° Kelvin, 525° Celcius, or 977° Farenheight

[@johannjomy8764]

with other bodies it does but it isn't visible

[@deltainfinium869]

I wonder if it'd be possible to run simulations longer by varying the particle count live based on forces on each contiguous body of particles, lowering it when the object is virtually stable, and raising it as an impactor approaches, also giving more focus to the impact site then the rest of the planet.

[@pavelsevecek]

I've tried something like that and it didn't work too well, the solver gets quite inefficient when there are particles that differ significantly in size.

[@petterlarsson7257]

​@@pavelsevecekwell you could probably make a smooth transition between particle sizes so that it isnt like small small large large but instead small small sorta medium sorta medium medium medium sorta large sorta large large large

[@KazmirRunik]

If you look up "3d bounding box tree," this concept has been well-explored! Sparse interactors get less power dedicated to them, while dense interactors get most of the calculations.

[@AlternateIsopod]

this will damage the dolphin population

[@Coolfaceguy1]

This will affect fishing season

[@AlternateIsopod]

@@Coolfaceguy1 nooo not the fishing season!!!

[@invisibleHturgeon666]

Moon crashes at Earth Earth's water: 🌊🌊🌊🌊🌊🌊🌊🌊

[@badpiggies988]

This would have grave impacts on the ocean pH

[@spaceguy20_12]

this will massively affect the horse crab population

[@invisibleHturgeon666]

When moon crashes at Earth Earth water: 🌊🌊🌊🌊🌊🌊🌊

[@krio1267]

majora mask

[@aSpyIntheHaus]

Earth: "Hello Egg!" Moon: "Excuse me, just need to...just going to try fit in he... just going to sneak in here." Earth: :0

[@Darkness_Black_hole_355]

Nice 👍

[@Dkggdd]

I think it would affect the climate

[@Astrominecraft2722]

This will affect the shrimp production

[@thatrandomspaceguy]

What are the specs of your computer, because this is like 10-50mil. objects, and my computer struggles with 500k.

[@ljushastighet]

idk but his computer is not anything crazy he just did this on his home pc

[@tygical]

wait is the earth gonna look like that in later updates

[@jackbearscience8771]

0:49 could the moon collision makes the earth's rotation change to 98 axis?

[@theodom1858]

I don’t think there would be an axis anymore

[@petterlarsson7257]

@UPS WINDOWS what 360 degrees is the same as 0

[@sailcg]

if the moon free fall to the earth, the impact speed would be aroumd 10km/s,right?

[@theodom1858]

Why is that?

[@netric9084]

@@theodom1858 gravity

[@theodom1858]

@@netric9084 gravity is keeping the moon in the air, or space I should say.

[@netric9084]

@@theodom1858 No, The Moon's horizontal speed is. gravity pulls it towards Earth, but the Moon's horizontal speed ensures that it never actually hits Earth.

[@theodom1858]

@@netric9084 well yes but it’s all part of a system. Horizontal speed keeps it in the air and gravity keeps it in its orbit. But that acceleration a_n is the gravity between earth and the moon. So saying the moon would hit the earth with a normal speed Vn and then saying that Vn is defined by gravity is a bit arbitrary to me since in fact it’s gravity determining the horizontal (tangential) speed Vt to keep the moon in orbit. Hence when asking “why 10km/s” I was hoping to get something of a calculation or a reasoning that explained more than “gravity” which could also, and more directly, explain why the moon does NOT hit the earth.

[@y29977]

The fragments looks more like a water physics rather than the real one

[@potatopilot1699]

You’d be surprised how many large scale collisions behave like liquids.

[@johannjomy8764]

you say it like it has already happened

[@y29977]

@@johannjomy8764 ok

[@perfectionbox]

Putin: "As long as Ukraine is toast, I don't care."

[@GustavoAldana-cb7hp]

I would like a colision between Earth and Venus

[@pikambal1105]

gow do you add so many partcles

[@SVMNSP6213YT]

Nice

[@abhaykrishna9292]

i like the when moon hits the earth but earths like i am fine but its just jello

[@petterlarsson7257]

10 MILLION PARTICLES HOW FREAKING LONG DID THIS TAKE

[@ljushastighet]

i asked him in the discord, he said about a day.

[@thatrandomspaceguy]

​@@ljushastighet wtf

[@a-ragdoll]

cool

[@Mycatkeepstryingtodestroymybed]

I wonder what it uses cpu or gpu if so then how much does it use

[@Zordiak]

GPU

[@Mycatkeepstryingtodestroymybed]

@@Zordiak I found out 1 yeaR ago it was cpu

[@thatrandomspaceguy]

CPU and GPU. CPU for the actual simulation, and the GPU for the render (the video).

[@Kindo_boi_2024]

morroco: 💀 spain: 💀

[@Dungas]

how many days to process all of this?

[@ljushastighet]

pavel said around 1 day when i asked him

[@astraluna6is9]

Ba Dee Ba Dee Ba Dee THATS ALL FOLKS!!

[@romeranthonyrea8258]

Credit to the camera man who went to a differient universe just to take this shot.

[@ljushastighet]

00:48

[@Astrodude.]

how did you simulate that many particles

[@ljushastighet]

because................................................................................ he typed in 10000000 particles and ran the simulation?

[@Astrodude.]

no i was asking how did his computer survive that many particles@@ljushastighet

[@py8554]

It hit the Sahara desert….

[@benjaminrickdonaldson]

how many particles was that?

[@axelaugust5552]

10 million

[@benjaminrickdonaldson]

bloody hell.​

[@dpterminusreal]

*live footage: your house*

[@Kronos.Saturn]

this would have a slight effect on vaccine research

[@user-tn8pr9uz5s]

Bro has super computer

[@fernanduvito28410]

Not really, when you finish recording the simulator it speeds up the simulation you recorded.

[@user-tn8pr9uz5s]

I know I was joking

[@petterlarsson7257]

this might effect morocco's healthcare workers

[@Bendy_comments]

Game name?

[@johannjomy8764]

space sim

[@1997emblemas]

Nooooo, mi españita!!!!

[@doorsportuguese]

Im in Portugal

[@triopical6884]

everyone would die anyways

[@androlipo1204]

africa: what a nic- WHAT THE F- ( 1800 - 2024 )

[@sayochikun3288]

im not sure about the earth's liquidish behaviour happening at the last second of the video

[@kellanfeng]

I think most of the crust and mantle would be turned to liquid because of the huge amounts of energy released. But yes, the behavior of earth in the simulation is quite strange

[@sayochikun3288]

@@kellanfeng says the planet with no proper ground xd

[@netric9084]

At that scale and those energies involved, rock acts like liquid, even if it's solid. That's why the planets are round and not jagged.

[@Sucrose_Snowstorm5149]

Minor inconvenience

[@spacegames6394]

*outro music*

[@RetroWaveRider]

Slight inconvenience

[@armendfiqi]

Yeah this is sure gonna impact corn harvest this year

[@el_noob_XD]

WTF

[@marcinkucharski4730]

Thisbisnt slowmo its real time

[@thatrandomspaceguy]

Not even real time, actually faster (I think)

[@TophatDude1]

It crashed into my city ):

[@tls559]

And into my country ):

[@ace911turbo]

And into my continent :(

[@petterlarsson7257]

If youre on the other side of the planet youre still dead

[@kui2012]

You live in bri-ish

[@punani_tsunami69]

In Soviet Russia, Moon visit you.

[@Spikeydelic]

ofcouce it hits africa :'D

[@pavelsevecek]

Pretty sure it doesn't matter what it hits.

[@FrostbitexP]

It mostly hit desert. Europe say bye bye almost instantly though.

[@petterlarsson7257]

It was a graystillplays reference

[@Spikeydelic]

@@petterlarsson7257 +1 haha

[@Flashisgreatfr]

wouldn't the moon just get ripped apart in the roche limit?

[@marcusjuliangarcia7693]

He didnt curved it so he just shot the moon towards earth

[@thatrandomspaceguy]

It's not an asteroid, it's the moon, and he didn't curved the orbit, but I did in one of my last videos.