The Fabric of Spacetime with Neil deGrasse Tyson

The Fabric of Spacetime with Neil deGrasse Tyson - Cosmic Queries

Рет қаралды 612,342

Күн бұрын

Is it time to rethink string theory? Neil deGrasse Tyson and comedian Chuck Nice explore a mix of questions about the fundamental properties of the universe, particles, the speed of light and more!
Could we someday observe particles without smashing them? We take a question from a particle pacifist as well as discover why clouds stay up. Is everything actually floating? We discuss the mystery of electrons: how small are they really? We explore JWST and ponder the problem of primordial galaxies. What does this discovery change about our understanding of the universe?
Is space an emergent property of the universe and not fundamental? Find out how quantum entanglement may weave the fabric of spacetime and why it may be time to rethink string theory. We discuss time dilation while traveling to Mars, what to do when you have an untestable hypothesis, and how Einstein tested the equivalence principle.
Why are photons always moving at the speed of light? What is time like at the speed of light? Learn about the solar neutrino problem and how neutrinos decay. We also explore the dimensionality of parallel lines and how they can, in fact, intersect. All that and more on a another Grab Bag Cosmic Queries!
Thanks to our Patrons Jagan, Stephen Abraham, Dalton Gordon, Brent C, Alexander Miller, t K, and Bob Morrison for supporting us this week.
NOTE: StarTalk+ Patrons can watch or listen to this entire episode commercial-free.
About the prints that flank Neil in this video:
"Black Swan” & "White Swan" limited edition serigraph prints by Coast Salish artist Jane Kwatleematt Marston. For more information about this artist and her work, visit Inuit Gallery of Vancouver. inuit.com/
Get the NEW Cosmic Queries book (5/5 ⭐s on Amazon!): amzn.to/3dYIEQF
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About StarTalk:
Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!
#StarTalk #neildegrassetyson
00:00 - Grab Bag Time
00:45 - Could We Observe Particles Intact Without Particle Accelerators?
3:50 - If Gravity Pulls Everything Down, How Do Clouds Stay Up?
09:54 - Is “Particle” a Placeholder Name?
12:50 - Could JWSTs Primordial Galaxies be a Window Into Another Universe?
18:35 - Why Do We Think Space Is Emergent and Not Fundamental?
24:55 - Time Dilation & Traveling to Mars
28:54 - If String Theory is so Unprovable, Why Are We Still Trying to Prove It?
37:32 - If a Photon is a Particle, Can't it Just Sit Still? Why is it Always Moving at the Speed of Light?
42:37 - Parallel Lines in the Fourth Dimension

Пікірлер: 1 000

@StarTalk Жыл бұрын

What are your thoughts on string theory? Is it still worth trying to prove it, or should we refocus our efforts on other scientific questions?

@popbigdaddy9422 Жыл бұрын

Why not do everything at once?

@genericusername5909 Жыл бұрын

Some of the surreal suggestions from string theory kind of upset me. Like calculating the pattern on Russell’s teapot and debating who is right with a captive audience

@MorallyResponsible Жыл бұрын

Consciousness can only be experienced. For example, if you had a tooth pain. Million Scientists with their Test tube(Deduction/induction via empiricism) can tell you there is no evidence of tooth pain. You will reject their scientific method because you are having direct experience of this pain. I have direct experience of existence. All i know with certainty is my experience ("Cogito Ergo Sum"). I know with certainty that this existence can only come from pre-existing Self-Sufficient/Perfect Existence(Allah the most Exalted).You have a direct proof of Allah(one/indivisible/self-sufficient/All-loving/unique) with every waking moment through direct experience of life. Once liberalism is replaced by the law of Quran/Sunnah all of the "strings" will come together in harmony/peace/justice and most importantly mercy.

@MizanHIT Жыл бұрын

this lapses

@michaelstary3463 Жыл бұрын

isn't everything just energy vibrating at at its own specific frequency? Everything must have a specific wave form... which makes that object unique. Sound (frequency) passing through a glass sphere filled with water will create light at the center of the sphere. The ingredients are a perfect sphere, water (waves) and sound. (frequency) achieving light speed could just be a matter of finding the correct frequency... and vibrating in one spot at that specific frequency.

@joseimpact Жыл бұрын

startalk literally makes my day better instantly

@petercorcoran2702 Жыл бұрын

Mee. Too. !

@jdonehew Жыл бұрын

Agree.

@GizzyDillespee Жыл бұрын

For me, it takes a few moments for it to kick in. But I'm much denser than air

@adrieldelgado4523 Жыл бұрын

Same man

@davidsasse40 Жыл бұрын

Not instantly, at the speed of light and sound!

@williamdeangellodavis2224 Жыл бұрын

Never take chuck off the show😭I’m begging you guys 🙏🏾🌼

@MrMitchbow 2 ай бұрын

He’s the everyman competing at the Olympics for reference

@Kojdo-AdwoaXaquayza-xd3sg 2 ай бұрын

What if chucks wants to go out and do other stuff? It'd be sad but sometimes it happens. And it'd happen not because chuck hates this but sometimes people just wanna go out and do something new.

@syedajwad6979 Ай бұрын

I hope I didn't find that Episode where there is no chuck. I think in almost all episodes chuck is present ❤

@r4v4g3r Ай бұрын

Reverse psychology, eh? I like your style.

@themusicbook8679 Ай бұрын

This comment cant get enough Likes. Chucks is PERFECT for this show, perfect for Neil and perfect to keep people interested. Rock on Chuck!

@GEEK-3 Жыл бұрын

Neil and Chuck are National Treasures, please never stop making these videos

@nicolau2 Жыл бұрын

This is a Cosmic* treasure

@gorillafacewastaken Жыл бұрын

Ey, don't forget Chuck

@GEEK-3 Жыл бұрын

@@gorillafacewastaken updated it brother, thanks for the correction

@gorillafacewastaken Жыл бұрын

@@GEEK-3 Perfect👍

@StarTalk Жыл бұрын

If you insist!

@alexaales7937 Жыл бұрын

i really like the fact that Neil considers himself my personal astro physicist. thank you for that, Neil, you've got the job any day of my life! much love from Germany!

@lemongavine Жыл бұрын

Great comment!

@alexaales7937 Жыл бұрын

@Conon the Binarian⚧ danke für den tip, werde ich machen 🙂

@duanemorgan8065 Жыл бұрын

Somedays I have to rewatch the shows at least three times to grasp most of what Neil was saying, God bless you Chuck don’t know how you keep up with Neil so easily

@Sinner119 Жыл бұрын

right! some people make fun of chuck but I know damn well I wouldn't be able to keep up! I know what I know and that's public health/polotics, not astro physics lol

@timhyatt9185 11 ай бұрын

check is there to be our "everyman" point of view.... (he's also my favorite co-host by far!!) I'd love to have both of them sitting around a campfire or quiet bar table sharing a drink, and ask them about what fascinates them in science...

@user-tc1fw5ms5s Жыл бұрын

Me: New episode of ST - YES!! Cosmic Query Edition - YES!! My cohost Chuck Nice - YES!!!!!!! Its a guaranteed banger

@dawnhansen7886 Жыл бұрын

100 % Agree ❕️

@chrisnel813 Жыл бұрын

Love this show, love his teaching style, whereas if every teacher possessed his ability to engage i would be a lifetime willing learner.

@morbidmanmusic Жыл бұрын

Law of averages says most teachers do. ..

@maniacslap1623 3 ай бұрын

I would definitely advocate for these videos in the classroom. These two together really make it easy to engage.

@crewrangergaming9582 Жыл бұрын

the moment Chuck figures out Neutrinos don't travel at the speed of light. Damn man!! Love his energy and enthusiasm.

@TheFlyingstop Жыл бұрын

My brain hurts. I'll have to watch it again and again and again ….. No gain without any pain. Thanks guys loving it.

@nathanrussell2158 7 ай бұрын

I’m sure I could watch this all day and forget to sleep.

@rangerCG Жыл бұрын

Thanks for answering my question about particles guys!!! That's an amazing answer! My wife and I were listening to the show in the car and when Chuck read my name, which we weren't expecting at all, we were just listening to an episode of Startalk, we looked at each other and freaked out😂😂😂

@MonicaRanger Жыл бұрын

This is true.☺💋

@rangerCG Жыл бұрын

@@MonicaRanger😘😉😉

@DrDeuteron Жыл бұрын

1) timestamp? 2) get a room already!

@tylerlormand5644 9 ай бұрын

awe sit down that wasnt you

@vikineo 10 ай бұрын

This series needs like a billion views. Extremely interesting

@PrestonSmithsMusic Жыл бұрын

That was great, thanks guys! Keep up the fantastic work! I LOVED those questions. The answers were amazing, well delivered, and I appreciate Doctor Chuck's childlike wonder on many of those! Cheers!

@joehebert789 Жыл бұрын

Wow. What a great episode. I loved these topics.

@MondoLeStraka Жыл бұрын

This is one of the best episodes of StarTalk.

@B3R34L Жыл бұрын

Love these explainers. I learned so much

@LEDewey_MD Жыл бұрын

What an AWESOME episode of StarTalk!! You guys covered everything from String Theory, General Relativity along with the Equivalence Principle, geometry of space-time, why orbits are elipses (and not circles), science of neutrinos and their differences from electrons, evolution of the Universe...(did I miss anything?) You can all go home now having solved all of physics! :D

@siroswaldfortitude5346 11 ай бұрын

Particles have rights!

@billbaker9623 Жыл бұрын

Thank you gentlemen for another educational and entertaining episode. Chuck, the Cajun chef to whom you refer is probably Justin Wilson. He was indeed on PBS back in the days when dinosaurs walked the earth (I know because I too was there) and was also entertaining and educational in all manner of food.

@shanoukgaming6763 Жыл бұрын

Yes he's definitely talking about Justin Williams I garunnnnnteee.

@rileyshelton2850 Жыл бұрын

One cup of wine and as the cup overflows make that one cup heaping.

@billbaker9623 Жыл бұрын

@@shanoukgaming6763

@glentorn5362 Жыл бұрын

I always check in with Neil for mind-blowing updates. 💥

@bentleestarr1575 Жыл бұрын

Two of the funniest and intelligent men I’ve ever had the pleasure of watching. Keep up the good work.

@blancavazquez1305 Жыл бұрын

Justin Wilson was the PBS chef...thank you Chuck for the memories! Grab bag...Gumbo...either way these are so much fun!

@mujigikabugi3927 Жыл бұрын

Who is here that has realized that Lord Chuck could be taking some lessons/classes in Theoretical physics or experimental physics? Damn, the guy is so sharp nowadays and knowledgeable. Indeed birds that flock together stay together. Kudos Chuck,,,

@skeller61 Жыл бұрын

Great episode! One thing you could also say about clouds are that they are made up of very small particles of water, each of which is buoyant enough to follow air currents. However, when these collect together they form drops of rain or snowflakes that are ‘heavy’ enough to be affected by gravity and fall. In cumulonimbus clouds, sometimes the updraft of air is so severe that hail that is falling is sent back up to gain size. That’s why you occasionally hear of ‘softball’ sized hail. The forces in thunderstorms are amazing.

@Maxrepfitgm 6 ай бұрын

You didn't finish...

@scholarshipsnmiy7692 Жыл бұрын

I LOVE you guys!! I understood so much more with this episode🙌🏼🙌🏼✨✨

@tmrogers87 Жыл бұрын

23:13 bro we need a whole episode on this. And get Chuck a blunt. It’ll be your best video!

@Wis_Dom Жыл бұрын

37:06 The guy you were referring too is Justin Wilson. The show was called " Louisiana Cookin' " on PBS. My mother and I loved watching his program back in the day and hearing his stories. I hardly knew what he was saying (other than, "I guarONtee"), but my southern mother understood his every word. 🤣

@user-qr8ff8rw8k Жыл бұрын

I appreciate all the help time and attention you've both given us as viewers, seriously 😣 without limits for thought. Ty

@furrybear7853 Жыл бұрын

Times are hard for me right now but wish I was a patron member this channel is by far my favourite! Still fantastic we get most of it free but theres 2 questions I have that I simply cant find any remote answer that comes even close to satisfaction, maybe there isnt any but I know for should if NDT didnt want to even make an attempt! ❤

@Ali-lm7uw Жыл бұрын

Try asking gpt 4

@furrybear7853 11 ай бұрын

@@Ali-lm7uw How much does that cost to use, I'm pretty sure it's not free and CBT3 fails miserably to answer both questions satisfactory!?

@BM-su7kc 11 ай бұрын

After 5 years of star talk, Chuck finally had his PHD in physics.

@nefertariali6378 10 ай бұрын

lmao!! so true

@jasonlaine8449 6 ай бұрын

I think he's a very long way off. He's idiotic. I guess he makes some people feel smart. He tries too hard with his jokes

@masonkeener4778 8 ай бұрын

When I have nothing I still have startalk. It’s a breath of fresh air to see people thinking outside of the boundaries of thought that it feels like we were meant to be trapped in. My brain only feels free during these times. Between thinking about work and my small family this is a light for me and I will be forever great full

@pjganguly Жыл бұрын

The best thing to start a day with!! Meditative, contemplative and so much fun even for the science layman with a curious mind!! Thanks team Startalk!!

@StarTalk Жыл бұрын

You're welcome!

@comparedtowhat2638 Жыл бұрын

This is an amazing and wonderful session. That took some real stamina for both of them.

@broadcastingbritain Жыл бұрын

Love learning for a few hours a day from this guy

@PandasEatBamboo Жыл бұрын

My dog passed away today. This was the best 48 minutes I've spent today. Thank you guys for what yall do.

@Gordon_L Жыл бұрын

Sorry to hear that . Unfortunately it happens , dogs , other pets , people . Grief is the price of love , as hard as grief is to endure , it's better than a life without love . The grief will fade , the love will endure in memory . Be kind to yourself .

@PandasEatBamboo Жыл бұрын

@@Gordon_L Thank you for the kind words, I really needed them. Hope you're having a great day.

@Gordon_L Жыл бұрын

@@PandasEatBamboo You're welcome my friend , all the best 🙂

@linyenchin6773 Жыл бұрын

24:09 No, Chuck, you don't mean "sentient" aka "having senses," you mean *Sapient* aka "having sense of self."

@420Khatz Жыл бұрын

I love seeing this wholesome, fun, black energy in the context of an educational science video- as well as how you treated each and every question as being just as valid as the next, always entertaining everyone's wonder and curiosity. I laughed a lot and really enjoyed this- you guys rock!

@orilion1820 Жыл бұрын

What is "black" energy 🤔

@420Khatz Жыл бұрын

@@orilion1820 that energy that tends to arise when black people are in their element, having a great time. I don't know what else to call it but it's not a vibe anyone else but black people can authentically bring- not at all to say that other cultures don't have their own very specific awesome vibes as well. I'm just saying, I love to see it in this context especially when the field is often so dominated by white men with a very serious approach.

@briseboy 10 ай бұрын

An imaginary phenomenon, as a smile tends to light up neurons & minds.

@alternavent 5 ай бұрын

I never get tired of this stuff.

@richkroberts Жыл бұрын

Very enjoyable session today Neil snd Chuck. Great stuff!

@RupertReynolds1962 Жыл бұрын

Archimedes gave us a good theory of buoyancy back in 200-and-something BCE, it seems to me. A very clever and productive human, he was. It seems to me we should be teaching the sciences in schools with historic scientific discoveries such as his, partly because we've had over 2,200 years if scientific observations to show some way in which he was wrong, and that's a good sign of a very successful theory :-)

@Ramennoodles008 Жыл бұрын

Hi Neil love your videos And they help me learn astronomy

@sunny_senpai 5 ай бұрын

perhaps the best ep yet, all great questions

@KetogenicGuitars Жыл бұрын

Incredible episode! It is much more impactful played at 0.75 speed when you have time to let personal ponder to emerge.

@LycterWarlock Жыл бұрын

Every time Neil talks about how quantum entanglement works, it sounds like its just travelling through a fourth dimensional pathway we have yet to learn to observe.

@pjg6019 Ай бұрын

Sometimes physics sounds like philosophy

@TheOldHippiebilly 22 күн бұрын

Hence the term "metaphysics."

@teknophyle1 6 сағат бұрын

pretty sure it literally starts as philosophy until it can be proven with the scientific method

@raymack9201 Жыл бұрын

You guys are awesome and so great to watch and listen to.

@GreenAppelPie Жыл бұрын

Dayum what an excellent episode. Great questions, more of these please

@Interloper12 Жыл бұрын

The whole neutrino oscillation discussion gets me thinking about the whole possibility that the universe keeps pulling a veil over our eyes to hide the truth from us... big galaxies in the early universe, neutrinos that change so we can't measure the original flavor, the inability to localize electrons. I feel like it's all connected to some elaborately woven conspiracy conjured up by the universe itself.

@DaddyHensei Жыл бұрын

It’s the cosmic joke. It’ll give us the build up but not the punch line.

@NotTheEx 11 ай бұрын

The mysteries of God's creation that flesh can neither reveal nor receive.

@IWasAlwaysNeverAnywhere Жыл бұрын

i learned by no mans sky that its actually faster to rise above the atmosphere to travel somewhere than to travel through it. so it would take longer to fly a jet along the surface of the earth than it would if you went some distance into the sky and then back down again. thats what the game taught me at least idk if thats reality :)

@affordablewebsiterescue Жыл бұрын

This is one of the best science sessions I've ever heard! Funny too!!!!

@vickieysacoff4249 10 ай бұрын

That information on neutrinos is so cool! Neil always explains things in such an understandable way. 😊

@ar_badical Жыл бұрын

Neil, what happens if you operate a "particular smasher" (LOL) in zero gravity?

@Alfiy_Wolf Жыл бұрын

String theory can’t be real if it was all the strings would have snapped carrying humanities issues

@Rocinster Жыл бұрын

Is it an american thing to use "of" instead of have? It looks so wrong

@J040PL7 Жыл бұрын

@@Rocinster I've seen road man in London using that too 😂

@ginnyjollykidd Жыл бұрын

It is wrong. It is "Would have." The pronunciation gets in the way of the meaning. The pronunciation is a contraction: "would've" It is pronounced the same as "would of." That is how we end up with incorrect words. An English teacher these days would probably bury their face in their hands, roll their eyes skyward, and sigh helplessly at the fact that their students refuse to learn any semblance of standard grammar, syntax, spelling, and style.

@johnowens8992 Жыл бұрын

Weve never had less

@linyenchin6773 Жыл бұрын

Humanity's issues not "humanities issues." The nonsense term "humanities" is a woman(aka vague and useless) term similar to amenities in it being a worthless word for " useful items in a place or situation you are in" but more worthless as it is a super vague reference to "the state of affairs" in cultivating all the avenues of curiosity and general experience that is typical in the human existence. Intellectual males are just females in the bodies of men, they adore obnoxious vagueness and inventing useless terns to reflect their fragments~tangents of retardation or "perspective." So called "humanities" is just one such worthless perspective.

@MeelaudBoozary 5 ай бұрын

Chuck and Neil are the perfect combo

@RichardSmith-pb8qk 11 ай бұрын

Love Startalk. Thank you so much!

@gonegahgah Жыл бұрын

22:00 minutes in, and doing other stuff at the same time, and I've heard enough of this, thank you.

@BeamMonsterZeus 5 ай бұрын

Chuck deserves to live on this program full-time - I don't care if he can't pronounce names more complex than Mark and Chris, his humor fits perfectly.

@belkyhernandez8281 Жыл бұрын

Wow....Impressed by Chuck's understanding of neutrinos and the relationship to the speed of light.

@ameliaburton3426 10 ай бұрын

I love his Great Courses videos

@marks8437 11 ай бұрын

This is a great episode! So many tantalizing topics to tickle my brain, sprinkled with humor that made me rewind multiple times!

@troymosher4877 Жыл бұрын

Chuck is back! He's growing on me.

@user-tw6my8eb1i 11 ай бұрын

I'm so happy I'm part of a generation that can just turn on thoer phone n search unlimited information..I wished throughout school I had this but having access now keeps me learning something new every single day or several things a day.im excited always to listen to yall n I'm not stuck begging a teacher or getting to a library..which took away so much time that I can now spend wide eyed ears open n soaking this all in.thank you GOD n thank u Neil n others for sharing so much knowledge..we couldn't ask or want 4 more.its the best!

@surfmarine3118 5 ай бұрын

Chuck's deftly tuned wit always enhances Neal's style of delivery. More evidence for the hypothesis that learning new information seems to be more easily achieved while one is in a good mood.

@angrybeluga1697 5 ай бұрын

Love this channel! I once had a cosmology teacher like this once and it was great.

@munchkinmatt1670 Жыл бұрын

This was a WONDERFUL talk!!

@progresssonsgaming 5 ай бұрын

Watching these videos have really helped me because i would wonder a lot of these questions but wouldn’t know who or where to go for some explanation. I’m not sure if i can 100% agree upon all these answers but I sure can relate and just keep learning

@user-bb4wj7lq3t Жыл бұрын

Neil, I’m glad you live in my iPad and teach me things while I’m at work.

@michaelchristian8220 26 күн бұрын

I had no idea that we know so much about electrons, but don't know their size.... mind-blown

@nmw_nerk Жыл бұрын

Virtual particles linked by wormholes that weave the fabric of space and time blew my mind. And also the beginning of the universe still existing within the 4th dimension of time, the time arcs on the surface of the balloon. Losing sleep on this gumbo for sure.

@BenjySparky Жыл бұрын

Neil and Chuck y'all rock! Peace

@andrefoisy7310 Жыл бұрын

I wish these went Longer

@juliam7056 Жыл бұрын

You guys are the BEST !!!

@navigatore2099 5 ай бұрын

What a wisdom... Thank you.

@ekothesilent9456 Жыл бұрын

This was the best show in a long time!!!

@EJKelly 6 ай бұрын

What a great way to learn new stuff..avid fan.

@lennysaturn Жыл бұрын

this was an awesome episode

@Ruy_O 11 ай бұрын

What a great episode! Thank you!! All the best from Mexico

@BlueDreamGaming Жыл бұрын

So fascinating...!

@detectivehowardb7 Жыл бұрын

Yes the electron bit was nice I'm right there with you Chuck, amazing! thanks Neil

@peronkop 11 ай бұрын

But is it True? Pretty sure I learned a relative size of the electron to the nucleus. Why did that change?

@olgagaisan5155 Жыл бұрын

Love you guys!!!❤

@heatherbrown4218 29 күн бұрын

Justin Wilson is the chef!

@cinbro3080 5 ай бұрын

Here we go!!! I Love this stuff and my kids do too. Thank you so much.

@raymondreyes5850 9 ай бұрын

Awesome episode ❤

@DaellusKnights 6 ай бұрын

Grab Bag Edition is perhaps my absolute favoritest version of this show 😻 not just for the content but also hearing the thoughts and curiosities of people abroad 😺 (and let's be honest... that's when Chuck's at his Chuckiest!) 😹

@NickHaus683 Жыл бұрын

Neil!!!!!! I need a breakthrough from you and this channel.

@detectivehowardb7 Жыл бұрын

out of the bushes for that one. Thanks guys I enjoyed that.

@artswri Жыл бұрын

One of the best of some great videos, coolest of cool. And Lord Nice is at his erudite best (!)

@zelmatrix731 Жыл бұрын

Good Science, keep it up.

@ohheyitskevinc Жыл бұрын

11:41 - the great courses are really good. Have a couple on Audible, which are sometimes a little odd as I believe they’re videos originally, but still a great listen

@starryfolks Жыл бұрын

i want him to hit 100 million subs so everyone loves and respects astrophysics and science in general

@makayladorvil1542 Жыл бұрын

That was a good one

@wdvest8333 Жыл бұрын

I agree with Neil. Finally someone finally said it in public

@raaghavdatta7814 11 ай бұрын

this show is like therapy.

@blueskies7357 8 ай бұрын

This episode is amazing! So empty space could be like a field that's powering up everything inside the universe?

@scottwarthin1528 Жыл бұрын

Neutrinos! Blew my mind.

@siresbrs Жыл бұрын

Bring in Sheldon Cooper to help with that whole String Theory thing!

@IWasAlwaysNeverAnywhere Жыл бұрын

so. i think my idea about the double slit experiment is actually correct. when you do the double slit experiment and cause the interference pattern to emerge the photon is actually slowing down through time but in space it becomes unstable and can appear in a random location. it fell beneath the electromagnetic spectrum and all we are left with is evidence the waves which the photon was once surfing on before the experiment "broke down" maybe this is how you explain vaccum energy? idk some random thoughts for ya

@filipmilovanovic8942 Жыл бұрын

@Walker Fowland & @Niel - The answer is roughly YES! In 4-dimensional spacetime, gravity causes geodesics to get closer and sometimes intersect (on a sphere, they must intersect because they have nowhere else to go, but there's more room in 4D space for them to miss each other). Gravitating bodies just follow geodesics