Why Brooklyn Is Not Expanding

An answer to Alvy Singer's question in "Annie Hall"
by Paul Stankus.

Does the expanding universe carry things with it ? Your intuition might be that if space itself is expanding, then objects that are in space will somehow be carried by space.

Paul Stankus concludes "It will push things apart a little bit, or pull things together a little bit, but it won't continually drag them apart. Its a slight correction to the force law, which means a spring will be slightly bigger than it would be otherwise, or slightly smaller, depending on which way the universe is pushing it, and it will just sit there. The force is there, the force may change a little bit, as the Hubble constant changes, but it will always be small and its constant. It doesn't drag things apart. You don't get stuck in the flow and dragged apart. The effect of the expanding universe is a phantom force, which is extremely small, and its proportional to the distance."

Category:

Science & Technology

Tags:

• Cosmic
• Expansion
• Robertson-Walker
• metric
• cosmology

[dontbeaj3w]

"Space dont expanding or bend"

i doubt anyone would read anything beyond this horrible jumble of words.

[unemployedfreak]

He took a long time to explain something very simple:

We *are* being pulled apart (since --we believe-- we are in an *accelerating* universe) by an effective "phantom force," but the forces that hold us together are much stronger than that, so the *net* force that holds us together is just a tad less than it otherwise would be.

Probably similar to how you presumably become more bloated when the air pressure is lower.

[ThinkTank255]

"...so the *net* force that holds us together is just a tad less than it otherwise would be."

While I agree, I think "tad less" is an overestimation. It is barely measurable. It is 10^-14 times the force of gravity between the Earth and the moon. That is miniscule. There's probably more force from solar wind, other gravitational interactions, etc....

[Etimespace]

Space dont expanding or bend

Atoms nuclear expanding and expanding nuclear opening expanding electrons and expanding photons who open also energywawes where is very small expanding particle and so on.

I can expalin everything with pressure

check it out my video

No Gravity

Idea from Kuopio is a video where i told how visible Universe really MOVES

Lets told that for your friend. You can doing history with everybody who told that for some other people.

Thanks

[smilingladybird]

I love you.

[BrunoTheQuestionable]

One of the most fundamental principles of Physics is the conservation of mass/energy. This states that the amount of mass + energy in an isolated system remains constant. I'm afraid your theory is definitely wrong :(

[BrunoTheQuestionable]

Stankus explains that we're not expanding !

Even if we were expanding would we know about it ? If the wavelength of light also expanded then all our local measurements would be unchanged.

[BrunoTheQuestionable]

I think you mean dark energy not dark matter. That's the picture that I've got, though its only speculation as nothing is known about the nature of dark energy.

tronreitan is right that "matter starts off by moving away from all other matter, with velocity proportional to the distance" even just after the big bang.

[trondreitan]

Thanks, I will!

[BrunoTheQuestionable]

Interesting. The universe is always more complicated than we imagine.

BTW you might want to check out my little cosmology group (I've added some of your videos). I'll send you an invite.

[trondreitan]

This was something I studied on my master's degree. It turns out that you need a weakly hierarchical distribution, which can be glimpsed in the cosmological background radiation. This small inhomogeneities works on each others, so you get strong clustering on 'small' distances and weaker but still significant clustering on sizes up to 10% of the size of the observable universe.