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https://xkcd.com/2898

Alt text:

"Some people say light is waves, and some say it's particles, so I bet light is some in-between thing that's both wave and particle depending on how you look at it. Am I right?" "YES, BUT YOU SHOULDN'T BE!"

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[-] billwashere@lemmy.world 131 points 9 months ago

And that point is inside the sun.

[-] V0lD@lemmy.world 69 points 9 months ago

No actually. Due to Jupiter, the centre of mass of the solar system is actually very slightly outside of the sun

[-] afraid_of_zombies@lemmy.world 47 points 9 months ago

Leave it to Jupiter to mess yet another thing up

[-] frezik@midwest.social 18 points 9 months ago

Stupid lazy ass diabetus planet doesn't even have enough mass to fuse its hydrogen.

[-] RememberTheApollo_@lemmy.world 19 points 9 months ago

Wouldn’t the center of mass constantly be shifting by the planets’ varying positions in orbit?

[-] starman2112@lemmy.world 26 points 9 months ago* (last edited 9 months ago)

Yes, but it's mostly shifting because of Jupiter. It's just so dang heavy. Like, a couple times heavier than every other planet put together. I don't have the brain wattage to do the cool math right now, but a quick google search says that while the barycenter of the solar system does depend on all the planets, more often than not, it is outside the sun

[-] gandalf_der_12te@feddit.de 15 points 9 months ago* (last edited 9 months ago)

Easy reminder:

sun ~ 10^30 kg
jupiter ~ 10^27 kg
earth ~ 10^24 kg

so the ratio is always 1000:1

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[-] Flumpkin@slrpnk.net 11 points 9 months ago

So doesn't that mean the earth and sun do not orbit a common center but a varying point based on mostly Jupiter?

Centrists have bamboozled me again!

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[-] dirtbiker509@lemm.ee 31 points 9 months ago* (last edited 9 months ago)

No the comic is pointing out that the sun and the earth are both orbiting the milky way galactic center.

Edit: While also true, I was wrong, they orbit the center of mass of the two body problem (earth and sun). I still think that's too simple of a way to look at it. It's not a two body problem and the other planets and the whole galaxy are also in play.

[-] nonfuinoncuro@lemm.ee 19 points 9 months ago

I mean technically every body in the entire universe exerts gravity on everything else as long as it's in your light cone

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[-] prex@aussie.zone 106 points 9 months ago
[-] TimewornTraveler@lemm.ee 52 points 9 months ago* (last edited 9 months ago)

I appreciate the origin story being included in this cliché, cuz it got repeated so often on Reddit that people seemed to forget it was said by a parody of an obnoxious heartless bureaucrat and repeat the phrase without irony.

[-] Huschke@lemmy.world 13 points 9 months ago

You know, you are technically correct.

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[-] niktemadur@lemmy.world 78 points 9 months ago* (last edited 9 months ago)

It's called a barycenter, kids, a common center that both objects circle around. That common center happens to be inside the sun, but that's a topic for next week's class in this semester's AP Astrophysics program.

[-] Johanno@feddit.de 22 points 9 months ago

Same for earth and moon. The center is inside earth. But not that close to the center of the earth itself

[-] niktemadur@lemmy.world 19 points 9 months ago

Meanwhile, Pluto and Charon noticeably orbit each other, the barycenter being fully outside of Pluto's surface.

[-] Klear@sh.itjust.works 13 points 9 months ago

And Jupiter is so massive that its barycentre is (barely!) outside of the sun!

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[-] Hamartiogonic@sopuli.xyz 54 points 9 months ago* (last edited 9 months ago)

Apply that to the flat earth debate and you get an oblate spheroid.

[-] Thcdenton@lemmy.world 10 points 9 months ago

You're an oblate spheroid

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[-] lugal@lemmy.ml 40 points 9 months ago

Sometimes, both can be wrong. Both orbit the moon

[-] RobotToaster@mander.xyz 19 points 9 months ago

The Earth–Moon–Sun three body problem is apparently something that has been studied quite a bit in physics.

[-] lugal@lemmy.ml 10 points 9 months ago

And of cause there are 3 camps and alot of disagreements but essentially, the majority of scientists argue, like me, that it is the moon which is the center. You can always cite some fringe scientists arguing otherwise, that doesn't change the general consensus.

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[-] gandalf_der_12te@feddit.de 35 points 9 months ago

Is this... an introductory course in relativity, disguised as a joke?

Am I accidentally learning something here?

Guys?

[-] moosetwin@lemmy.dbzer0.com 20 points 9 months ago
[-] jungle@lemmy.world 36 points 9 months ago* (last edited 9 months ago)

Not really, relativity plays no role here. It's classical Newtonian physics.

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[-] Sotuanduso@lemm.ee 27 points 9 months ago

As a middle ground kind of guy, I would like to pre-emptively state that a lot of us don't actually think the answer is always the middle ground between two stances. It's just that we're more likely to propose a middle ground solution because we evaluate the plausibility of both stances in a more balanced way (as opposed to existing-stance-holders who are prone to bias towards their own stance.) When the two seem roughly equal in plausibility (which happens fairly often, otherwise the argument would be more one-sided,) that's an indication to evaluate the middle ground as well.

Middle ground folks are often caricaturized as wanting to find the middle ground between an objectively sensible point A and a radically wrong point B, when the spectrum of opinions is sort of like [ - - - - - A - | - - - - - - B ]. In that caricature, we're looking for a middle ground at point C [ - - - - - A - | - - C - - - B ], when in actuality we're evaluating (and not automatically accepting) something two or three steps closer to A. In some such cases, A might already be the most sensible middle ground.

[-] LazaroFilm@lemmy.world 22 points 9 months ago

Technically, the sun is pulled by the earth too so it’s sort of true.

[-] Bademantel@feddit.de 124 points 9 months ago

I mean, yeah. That's the joke.

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[-] Jaytreeman@kbin.social 19 points 9 months ago

Except it's still inside the sun, so depending on how big you view the center of the sun it could still be wrong.

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[-] lugal@lemmy.ml 13 points 9 months ago

My thought exactly but isn't the common center still inside the sun?

[-] knatschus@discuss.tchncs.de 15 points 9 months ago

Yes, but they still both orbit the black hole in the center of our galaxy

[-] kamenlady@lemmy.world 11 points 9 months ago

The urge to orbit a black hole is universal

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[-] hperrin@lemmy.world 18 points 9 months ago* (last edited 9 months ago)

I mean, no, not really. The gravitational center of the sun-earth system is within the sun itself, so the earth definitely orbits the sun and the sun definitely does not orbit the earth. Let alone the fact that the sun’s movement is predominantly driven by Jupiter. (The gravitational center of the sun-Jupiter system is just above the sun’s surface.)

[-] gapbetweenus@feddit.de 11 points 9 months ago

Pretty sure you can chose earth as fix point and have everything rotate around it on really strange orbits. Everything is kind of relative.

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[-] mcmoor@bookwormstory.social 18 points 9 months ago

The alt text makes this xkcd tier

[-] randomaccount43543@lemmy.world 17 points 9 months ago
[-] CosmicCleric@lemmy.world 10 points 9 months ago

If this topic proves anything, it's that we should make sure everyone is assuming the same thing before discussing, or clarify before discussing.

You can literally come up with different answers without further clarification.

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this post was submitted on 24 Feb 2024
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