The Power of Neutron Stars
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- čas přidán 16. 05. 2024
- When stars many times larger than our sun go supernova, their cores do not always collapse to form black holes. Some are not large enough to collapse to form a singularity, but instead shrink to an object the size of a city - a neutron star, which generates the strongest magnetic field in the universe. In this video, we will learn about their history, their variations, and the science behind it.
Do you use these videos to sleep or for night time watching? Check out the new sleeping space playlist, a collection of my most chilled out and ambient videos.
• Sleeping Space Playlist
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Music, Footage and Sources of Information: ========================
VIDEO MUSIC:
- Mind and Eye Journey - Emily A Sprague (CZcams Audio Library)
- Bug Catching - Emily A Sprague (CZcams Audio Library)
- Raise Your Hand if You Think That Evil Is Increasing In the World - Chris Zabriskie
- Approaching the Forest - CO.AG Music ( • Approaching The Forest... )
- Gaia in Fog - Dan Bodan (CZcams Audio Library)
- That Hopeful Future is All I've Ever Known - Chris Zabriskie
- They Call It Nature - Chris Zabriskie
- I Used To Need The Violence - Chris Zabriskie
- We Were Never Meant to Live Here - Chris Zabriskie
CO.AG Music: / @co.agmusic
All tracks by Chris Zabriskie licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
Artist: chriszabriskie.com/
FOOTAGE:
Multiple sequences in this video were captured using SpaceEngine Pro, the virtual universe simulator! spaceengine.org/
Get SpaceEngine on Steam and try it for yourself: store.steampowered.com/app/31...
Much of the stock footage in this video was provided by Videezy.com. Check them out:
www.videezy.com/
- "Pulsar in a Box" (NASA): • New Simulation Creates...
- NASA Neutron Star Collision Simulation (NASA): • NASA | Colliding Neutr...
- Simulation of Gravitational Waves (MIT): • LIGO again detects gra...
- VELA Pulsar Footage: • Vela Pulsar with sound...
- VELA Pulsar Sound Loop: • Pulsar SOUND
- LGM-1 Sound: • LGM 1 Pulsar -- 2 Hour...
- Lighthouse Footage: • lighthouse Lookout at ...
- Hubble Telescope Footage: • A Space Journey (HD)
- Blue Nebula Fly-Through: • DeepSpace Nebula - Fre...
- Nebula Eye Scene: • 4K Space Nebula scene ...
- Void / Dust Footage: • Video
- Supernova: • Live Super Nova Explos...
- Gamma Ray Burst: • Overview Animation of ...
SOURCES OF INFORMATION:
- The Structure of the Atom: www.qrg.northwestern.edu/proje...
- Neutrons: astronomy.swin.edu.au/cosmos/N...
- Statistics: www.space.com/22180-neutron-s...
- Largest Pulsar: en.wikipedia.org/wiki/PSR_J03...
- Pulsar Planets: en.wikipedia.org/wiki/Pulsar_...
- Diamond Planet: www.space.com/12731-diamond-a...
- Black Hole Eats Neutron Star: www.space.com/black-hole-swal... - Věda a technologie
When I go to bed, I have a playlist of this guys space videos. Is it weird that his videos help me fall asleep? Not that they are boring. I love astronomy. I just feel at peace.
He has a calming voice, and ruminating over the magnitude of space tends to squash all the smaller anxieties within us, which often lead to troubles falling asleep.
@Psychachu Music I never thought about it like that. Makes a lot of sense
You and me both
If you get "star travel dreams" like I do, it`s completely understandeable, other good narrators out there as well, but not too many americans, they tend to be all about "POWER, EXPLOSIONS and the FORCE! Insert ports analogies here" and it`s not exactly relaxing hehe
Edit: good thing someone liked that comment so I could fix that typo hehe xD
It's nice to let an orderly presentation of interesting facts run through the mind as you're trying to sleep. It's like somewhere between a bedtime story, a campfire tale, and a deep conversation.
Only a star is Badass enough to die .. and turn into another NEW and even more powerful star
The star is like "If you strike me down I shall become more powerful than you can possibly imagine"
Instarnation
@Freeman319 so this is the power of ultra instinct XD
Not just any star!!! Supernova Type A are pretty rare .. Too small and you get a White Dwarf, too big and you get a Black Hole... But universe is big ass place and it's not like we have a shortage of stars..
LJayy97 not only that the minerals are the best part! Stars could save humanity of a metal famine.
"Magnetar" sounds like a badass metal band.
Just the sound of a neutron star having "mountains" only a few mm high sounds utterly nuts.
*heavy* metal?
More like Pokémon
There is one called Crown Magnetar
And “halcyon” sounds more like Renaissance Hardcore than Artcore!
@@kcarcnohterc3134 You know what's funny? Plini is a member of a band called Halcyon.
Space, astronomy, and the universe, are in my opinion, the most fascinating field of study in existence. There is so much out there to inspire awe....Imagine what may yet to be discovered?
I have a couple ideas of topics you can cover.
Absolute Zero
Rogue Black Holes
Zombie Stars
The Boomerang Nebula (coldest place in the known universe)
Those are all great garage band names.
Sounds so pseudo science
Technically the coldest place in the known universe is in labs on earth
HanFei it's just the names sounding dramatic, haha. they're not pseudoscience
@@SoI_Badguy Can you say where? I can't find or read anything about it
That hollow thumping-clack of the pulsar’s “pulse” freaks me out and blows my mind at the same time.
I feel like it should used in a horror movie. It would totally work bc it kinda freaks me out too lmaoo
Same here!!
We felt the energy of 2 objects more or less 20km of diameter, colliding with each other 100 millions light-years away from us.
Damn....... i am out of words how epic this is .
"100 millions light-years away" also means 100 million years ago. Dinosaurs were still roaming the Earth.
Is there such a thing as absolute time or is it all relative?
bilbofker id say everything is relative because there couldn’t be an absolute of infinity
We had to detect variations that were smaller than the width of a proton to detect the gravitational waves
@@Nobnoxious heracy
I have no idea why, but your videos always help me sleep, and this one specifically always makes me sleep at night. I never make it to the end without falling asleep, and that's meant as a compliment! Neutron stars are my favorite things in space next to black holes, and your videos are super wellmade. I love them a lot!
Look up timelapse of the future
They wouldn't be your favorite thing close up, for then there wouldn't be any you,or me. A billion light years is a nice old distance for a neutron/black hole collision. Wouldn't wan't it any closer.
I sleep to his videos everyday
Joy Division's iconic first album cover. That just blew me away
Yea, I figured out what that was a couple years ago, took me 40 years 😂
right? insanity
Fu****g loser ass nerd
That is a damn good album, too.
@@Gr8peApe you’re a HERO…fuck you
ur legit the most enjoyable person to watch talk about this type thing. keep goin
Likewise. I also must mention Isaac Arthur being equally as enjoyable/informative.
I use to be more fascinated with black holes. Ever since I was little.
But lately I’ve been much more fascinated with neutron stars.
Ever since learning about nuclear pasta (possibly containing strange matter) and learning that the heavy elements are most likely created by a kilonova (two neutron stars colliding).
If these are true, neutron stars are by far the most important stellar object ever (in creating life, and if strange matter exists, destroying it).
So fascinating.
How more important than a black hole though....? Black holes could be the literal keys to the universe...
Neutron stars are way cooler because you can actually land on them! 😆🥰💯👍
@@nicolasnicolas3889theoretically. Not in reality.
@@nicolasnicolas3889 You'd have to be a very advanced civilization to be NEAR a Neutron Star, let alone land on one or be inside it.
Learning this in Science class is so incredibly painful, but every time I watch these videos I’m drowning in a sea of interesting and incredible information on our beautiful universe.
A lot of this is unproven bullshit
y'all learn this is science class !!! Am i the only one who is stuck with this apple thing of newton and all those laws ??
@@pallabchowdhury5045 you have to learn that first before even touching these subjects, also the math is extremely difficult but once you understand it, all of this will make sense lol
No math
I sea what you did there.
cheeky pulsars copying the joy division album cover.
Black Transmission
Lol pulsars came before joy division.
2 weeks before
@@boahnation9932 joy division came before the big bang. scientific facy
so many 'unknown pleasures' in this universe
Great video! Apparently, NASA just mapped the surface of a neutron star, and found that the "hotspots" where radiation was emitted were in strange places. You mentioned that neutron stars all emit radiation from their poles, but one pulsar was found to have multiple hotspots in the southern hemisphere, and none in the northern hemisphere, making it one of the most unique pulsars out there.
The hotspot emissions were nowhere near the power of the polar beams. It was the first time to map a surface so it is not certain this discovery makes the star unique!
Michael Jordan Yeah calling it unique is a mistake at this point. It's unique in that its the only observed in such a way but going beyond that and calling it unique among stellar objects is not an assertion that we can make just yet. We just don't know enough to say that.
Tom Easton neutron stars are one of the strangest objects in the universe if it were any denser it would become a black hole so what we are looking at is like a black hole but still a star and we can actually get a chunk of it
my theory is that there’s a small black hole in the center of the neutron star and the black hole can’t absorb the rest of the neutron star and when an object gets close the mass goes to the neutron star not the black hole so when the neoutron is at its final stage the black hole will absorb the neutron star and become a full black hole ( this is basically the quasi star which is hypothetical)
@@ryandelgo384 If a black hole were at the center of a neutron star, there would be nothing to stop it from feasting on the dense nuclear material around it. It would tear the neutron star apart and simply become a larger black hole and start doing its black hole thing. Neutron stars can become black holes by accreting enough mass, you're correct about that! It's possible the neutrons break down into a quark-gluon plasma at the center of the neutron star (neutrons are made of quarks). The conditions required to maintain a stable quark-gluon plasma are unthinkable.
I find it quite incredible how much of the universe we can discover in just one measly human lifetime (when compared to cosmic timescales that is)...
Yeah, wouldn’t it be nice to be able to discover for millennia?
@@IB4UUB4ME If we can avoid destroying ourselves first...or in the absence of GLOBAL CO-OPERATION we leave our descendant CHILDREN - it's "Oooh! Won't someone PLEASE thin of the children!!" all over again! Grrr! Just Imagine how warped we have become that THAT becomes a "meme" How MORONIC IS THAT??!! I mean - to be in the position that we have been forced into by our own acute mismanagement of our home....it exposes how STUPID we really are and it AIN'T a pretty sight. Oh dear! a dead planet where we just...constantly destroy everything we touch similar to bit similar to a certain EX-president I'm aware of...!)and be aware that we're doing exactly the WRONG thing at every opportunity...! Grrr! I guess we're screwed then. I feel ill; I need a drinc...!
That sound of Vela pulsar, has incredible energy.
M James it’s my favorite sound in the universe
@taha ch755 at the time any religious media was written they did not know about this pulsar because they did not have the technology to know about it. Lets just forget religion and stick to science and scientific theory.
The "drumming" intro music in the background is actually sound from neutron star 0:03-1:17
I thought it too immediately! I was like "why does the drumming sound like a pulsar with high rotation speed"
@@benjaminjernfors At first l thought it was PSR J1748-2446ad but then l listened for a few seconds and l was like "aha, it's good old PSR K1965-4532sd".
Bit embarrassing really.
@Blood Beryl I wrote it for some people who doesnt know, smart ass guy.
@Blood Beryl I didn't know that
@Blood Beryl Who the hell are you tryna control how we speak, you shit-eating gremlin
It's wild to think we've only known about neutrons for a few decades. The amount we've learned in such a short time is breathtaking.
And almost none of it is true!
@@imnewtothistuff your username name fits
@@gaemr_o5147 and you are a stupid fuck head! Do your research dick face!
@@imnewtothistuff not too sure what to say here
Only known about black holes since the 60s
Magnetars are hands down, the scariest boogiemen in the universe. I remember reading about a magnetar forming inside a supermassive star, and causing an explosion that sterilized everything within a thousand light-years or something
I saw something about that. That magnetar fucked that star all up. Like real real bad and then after a short while like you said boom. Everything within a thousand light years or so just.. obliterated
Makes u glad these objects are like a 100 million to a billion light years away ... even if one was 10 light years away we are screwed
Magnetars are so magnetic that they could rip the iron out of your blood at a distance of over 10,000 miles!
WOAH. Coooooooooool.....
Thatdudedevlin 07 till it happens to you
Meh
With only 10 000 miles between you and a magnetar, you will find yourself facing many detrimental physicals effects, among which having the iron ripped from your body is one of the least worrisome.
@@AndreasRavnestad true! Crazy how something so majestic and amazing could also be so deadly
This channel makes complex ideas so easy to understand. It's nice to watch before bed, half awake and half dreaming of space...
Magnetars are super rare... there are ONLY 30 million of them in our galaxy, alone. 🤯 That fact, in itself, spins my head faster than a pulsar!
Man our galaxy is massive imagine how many habitable worlds there are then
Plus there life span is only like 20000 years if that so beautiful but deadly
Probably the one time when 30 million is described as 'only', like it's a sale at a electronics store.
Well there are between 100 and 400 Billion total stars in the Milky Way galaxy, so I guess that does make sense when Magnetars are relatively rare.
I love how you described the tiny millimeter thick landscape as “mountains” . Neutron stars are so amazing. Think about how any object accelerates down towards the earths gravitational field at 9.8 m/s squared. If a teaspoon would accelerate to the speed that you mentioned then any object will also accelerate to that speed barring any angular momentum if they already have. As always great video I put on one of your playlist every night before bed and just Nerd out.
I put this guys videos on to fall asleep to, but in a good way. The way he presents this information is both intriguing and soooo soothing. Please don’t stop making these videos man!
Every time I'm watching your video I'm shocked when it's ending and want to see more of it. How good you're a presenter you have no idea man! Love ever moment
Turn on cartoon network🤣
@@MsThor1 Disney channel
Note how at the start of this video the background music was recorded neutron star sounds. Massive respect for that detail.
Thank you for your videos! They're so well done--the material, the information, the cinematography, and your voice is perfect for this
17:54 The heavy elements were not cooked up in the stars that came before them. They are basically fission products of the neutron star, which can be viewed as one giant atomic nucleus.
Not just fission but fusion too when 2 neutron star collides and the resulting Kilonova
Your on the right track. Good work to you!
Supernovas can create elements heavier than iron
Excellent video! I had been looking for a good video about Neutron Stars for a while!
I've been watching Sea for a very long time now, and I always come back to this video. This is to me the most fascinating, and incredible video I've ever seen.
This video was great. I just searched Neutron Star to learn about them. Had never heard of your channel. But I'm going to subscribe. Great work.
The sounds in the beginning are terrifying imagine hearing that in space and infront of you a neutron star
Glad I am not the only one creeped out by that! It sounds like something you'd use in a horror film to signify an evil presence.
Don't worry, this couldnt happen since you can't hear sounds in space
As always top notch quality and an exceptionally good story-telling. It's only a question of time until your channel experiences a supernovae, before collapsing into a magnetar - consuming every person getting within the gravity field of your content.
These videos are excellent. Thank-you for creating and sharing for all!
Such an incredibly well researched and well made video! As an avid space enthusiast I’m so impressed and eager to share with family & friends since it’s easily digestible for all kinds of ppl. Thank you sir!!!
Before you do so, fact check his claim that most stars go with supernova bang. It is horribly wrong...
Well there’s direct core collapse, un-nova, or they simply fizzle out over immense timespans but that’s not interesting to someone who’s being told about the wonders of the universe for the first time. Point taken tho.
Great insight buddy. I never new about the reverse pulsar location thing on the golden record....Thumbs up.
Neutron stars are incredible, they might actually help us understand what the "inside" of a black hole might look like
How?
Lol
@@CsykKrit It's similar, a really dense object.
@@AB-yf5ei a lot =/= infinitely. Traveling at 99.999999% C is nothing like traveling at C.
@@CsykKrit True
The into background sound was awesome. That’s the insane rotation speed of a neutron star converted into audio. One of the most extreme examples of Conservation of angular momentum in the universe.
Truly Awesome. Thanks for explaining and giving powerful perspectives on these terrifying objects.
9:55 Pretty crazy that Joy Division invented Neutron Stars
Mental isn't it
O
LoL
I enjoy these educational videos. I always love learning about the way our universe works. There is always something new to learn.
bruh this one truly blew my mind.. the scale of such events is incomprehensible.. cheers for instilling this feeling.. wow
I'm pausing this video to write this review! The background music is literally the would of a neutron star.. 😍😍😍 Hats off to you!! Please keep this amazing content going
I really like how the Sound of the neutron star pusling is like a massive bouncing ball off a thin metal sheet, and the imaging of it looks like an earthquake fissure. Scientists discover new forms of mass every now and then, I bet you can make exotic materials with the energy of a neutron star that has a higher complexity of properties than ones we can even imagine, dwarfing graphene and nanomaterials completely
Thanks once again for the immense effort in creating this video which I enjoyed thoroughly. Can never tire of this subject as neutron stars are wildly fascinating.
At 2:26 it's not only "bouncing off" the core, essentially the matter falling in gets so compressed and heated up it reaches the next threshold (where it previously failed which caused the fusion to cease) in which it produces the heavier elements by runaway fusion.
A fantastically informative and well delivered video. Thank you.
Excellent video, new subscriber. Keep up the good work please! Thanks for the upload.
I clicked *faster than the speed of light*
ME TOO !!!!
That pun though
Me 3!!!
You fell for it?
Wow you must have a really heavy and bright finger then :D
Jocelyn Bell Burnell actually discovered the pulsars. Although she doesn’t believe that she should have also been awarded the Nobel Prize in physics because she was a grad student, she is generally thought of as the one who discovered and had evidence of neutron stars/pulsars.
Thought by no one.
@@Szgerle Hate. Why so much hate, delusional kid?
@@hamzaijaz4133 What are you screaming on about?
Fascinating video, well delivered and really enjoyable.
Best lullaby on CZcams. You are not boring at all. But your videos put my mind at ease. I still retain a lot of it when I wake up.
Well done thanks. I first heard recording of pulsars as a teenager. After it was explained to me that a object the size of San Francisco but twice the mass of the sun was spinning at 40,000 RPMS, my hair stood on end. Now whenever I hear the recording of a spinning neutron star it effects me in a visceral manner. To hear these objects reminds me that the universe is indeed queerer than I can imagine yet is as real as objects here on earth.
Is is possible, instead of speaking of "the straw that broke the camel's back", to speak of "the hydrogen atom that transformed the neutron star into a black hole"?
Yes. That rolls off the tongue much better. 😁
The proton that core-collapsed the neutron star into Singularity.
@@jengleheimerschmitt7941 Still, the idea behind the question is interesting. Something as small as an atom can trigger one of the most violent event in the universe as it's mass tips the scale towards a black hole.
@@rundownaxe ...Imagine if someone started droping camels onto a neutron star that was just shy of collapsing into a black hole. One of them would be the camel that collapsed the neutron star into a singularity. ...so to speak... 😁
Santy Clause or the one or less higs einstein boson preventing a singularly
Brilliant presentation and so interesting. If you made similar videos I will certainly look forward to seeing them.
Interesting and very well researched making sense of what is very complex science.
I love when old friends are interested in the stuff I am, currently pursuing an Astrophysics degree! Hope YT has been well for you!
Sodium you go well in guacamole
I can't get over how fast these things spin
Love your contents mann! I really do, it's great to learn new things
You’re a real talent - love your work!
Pulsars are so fascinating yet a bit terrifying.
Nice channel, good content and well written.
Excellent video, with great simulations and written superbly and researched. Thank you!
The Universe becoming aware of itself is mind bending. Intelligent enough to create instruments to view what physics chemistry well all science put together can do 😁 so beautiful!
The idea to use pulsars as a map to find our solar system, dates back to early 70's, when plaques were installed to Pioneer 11 and 10. They were designed by Carl Sagan and Frank Drake.
That would have been a way better example, because it seems everyone will know Voyagers, but not Pioneer probes, which were the first to have a "calling card".
I never tire of learning about things like this. Great little film, this. Thanks for taking the time to make these. I love 'em!
Fantastic video. Objective and very informative.
Wow...one of the best SEA videos, IMO. Fascinating, riveting.
I've seen the Voyager record mentioned countless times on science shows but they usually just play clips of people saying "Hello" in different languages. I've never heard an explanation of what that picture on the disk actually means - so cool to find out it's a pulsar map!
6:30 "falling at well over 20 000 km/h when hitting the ground" - that is, the ground of the neutron star, not the Earth. I got confused there. :)
what? Lol
Its a teaspoon of neutron stars only, not the entire thing.
So it is the teaspoon of matter thats going at 20k km/s not the earth. Earth is much more massive than 100 million tons
@@_skyywave9740 I meant the ground that the teaspoon of stuff is falling towards. It's falling towards the surface of a neutron star, not towards the surface of the Earth. Secondly, movement is relative, so the ground is just as well falling towards the teaspoon. :)
Yes that got me too. The way he says it suggests that gravity on earth is dependent on the falling objects mass. NASA have a good video of a hammer and feather falling to earth in a vacuum chamber at exactly the same speed. In fact I am fairly sure I have also see a NASA video of astronauts doing the same thing on the surface of the moon too.
So a tea spoon of neutron star matter assuming it’s not a large proportion of the earths mass would only accelerate at roughly 9.81ms^2. Of course if it was say 1% of the earths mass then you would need to increase the acceleration by 1% because the earth would actually fall upward to the spoon at 1% of 9.81ms^2.
On the surface of a neutron star the gravity is going to be many millions of times more that 9.81ms^2. So yes dropping a teaspoon on the surface of neutron star would indeed travel much much faster than here on earth.
@@starcitizen890j5 Still, you wouldn't want to drop it on your foot..
@@starcitizen890j5it would fall faster
Well written! Poetic, in fact -- which adds to the content's awesome subject matter.
This was a fantastic video with amazing commentary.
Great video man thank you!
Thank you so very much. This was very interesting and informative. Well presented.
Awesome, a photo of a smiling Fritz Zwicky instead of scowling! Thanks for posting this for all of us to enjoy my friend, really good stuff! 👍 👍
Great video as always! Keep them coming please 😊
Still love this video. My favourite in the library
Great video, always looking forward to seeing that notification with the word SEA included! Love your astronomy videos just as much as your past GD videos :)
Like your stuff. Very cool, and informative. Thanks!
Outstanding production and narration. Fascinating content, too.
Joy Division's first album was so good that they turned the cover art into a real thing!
So awesome that that's where the cover of Unknown Pleasures comes from.
I could lowkey lay in bed listening to your voice and facts about space honestly... Thank youuu sm for making these!!!!
as usual your video are amazing, thanks alot mate
Love your content.. Not enough interest given to neutron stars.. It varies however I believe finding the most dense form of matter known to exist deserves intense interest.
"most of the time it does so in an incredible fashion¨ - actually, no. most stars just gradually cool off and become white dwarfs. only a few percent go supernova.
@Jean-Paul Teitu II yes, but such stars are only a tiny fraction of the star population.
Jean-Paul Teitu II the vast majority of stars are red dwarfs.
I've seen alot of docs on space and astronomy...this one is good!!
Thank you this was so mind boggling
The small size of a neutron star helps one to realize just how much empty space is between the atom's nucleus and it electron shells.
Honestly Your Voice is so very calm and melodic that i slept halfway, 10/10 would do it again
I agree. However I remember posting a comment on one if his first topics where his comments where read like one big sentence. Hurray to progress!
I honestly found his speech to be a bit to quiet. It gives this slight crackling noise whenever he is ending the sentences, and that wasn't to my liking.
I really liked the amount of information contained - Thanks for sharing, SEA.
you just hear the vela pulsar sound in background of video, love that 11x per second revolution noise.
Was not expecting to find out the origin of Joy Division's Unknown Pleasures album cover in this neutron star video. So glad I found this channel
When the alien capture the Voyager spacecraft, I'm sure they come to earth for record player.
I love how the video starts with the sound of a pulsar.
4:07 A photo of Fritz Zwicky actually SMILING?? That's as rare as anything found in deep space! Thanks for another great documentary my friend. Very good stuff indeed. 👍 👍
With someone who has a restless mind and insomnia, your videos help me go to sleep. Thanks!
I watch this exact video every week about 2-5 times! I love the information and scaling figures, they are out of this world 🌎!
I just wish I could see a neutron star. I don't want to die without seeing something as magnificent as a neutron star
(6:22) This shoulder-height drop speed measurement breaks with gravitational acceleration on Earth. A teaspoon size of neutron star matter (assuming one could keep it in such a state without the crushing gravity of the neutron star) dropped from shoulder height should have the same acceleration as a rubber ball dropped from the same height. The only difference between the two objects would be atmospheric friction.
Thanks, I had to pause the video and check in the comments if someone mentioned that or if It meant the earth would accelerate into the teaspoon due to its mass. Seemed a bit too heavy
I already knew 75% of this, but I still enjoyed it. Your presentation is very good.
I listen to these lectures to fall asleep - so relaxing yet fascinating