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Sep
6
comment How much has the Milky Way moved since it's forming?
Thanks, that comoving frame was exactly the reference frame i was thinking of.
Sep
6
comment How much has the Milky Way moved since it's forming?
thanks, relative to the CMB sounds good, and is probably what i meant. But on the other hand it opens up the question in my mind, if i can set the CMB as reference frame, why is it not the preferred reference frame that shouldn't exist?
Sep
6
accepted How much has the Milky Way moved since it's forming?
Sep
6
comment How much has the Milky Way moved since it's forming?
@DavidHammen I don't see how i am assuming in my question that the big bang itself happened at some specific point. I am only saying that what now is the Milky Way (or any galaxy) was at some point somewhere. I suppose not all galaxies move away from us at the same rate, thus they have velocity that is not explained by cosmic expansion. I don't see how the patch of space that the galaxy occupied a few billion years ago can't be a suitable reference frame (although it might be bigger now due to expansion).
Sep
5
asked How much has the Milky Way moved since it's forming?
Aug
18
comment Can we make usable energy from subnuclear particles?
Maybe we will boil a different fluid? ;-P
Aug
1
accepted Is this “cloaking in time” serious and what is really meant?
Aug
1
comment Is this “cloaking in time” serious and what is really meant?
Aren't waves continuous, why would there be a gap? Anyway, thanks for the explanation, together with the images i think i got the idea. Any idea what this "event" could be? I have a hard time imagining what kind of regular, distinct event messes with a light beam.
Aug
1
asked Is this “cloaking in time” serious and what is really meant?
Jul
30
awarded  Curious
Jul
29
accepted In a Big Crunch, would there be more mass than at the Big Bang?
Jul
29
asked In a Big Crunch, would there be more mass than at the Big Bang?
Jul
29
revised Does expanding space cost energy?
corrected proportiona vs inversely proportional
Jul
29
comment Does expanding space cost energy?
You probably wrote the answer before i made the edit, what i was getting at with "is space something" was really more "is space something that is created at the cost of energy", if that makes any sense at all (i was thinking similarly to how matter and energy are exchangeable, or maybe even the same thing, whatever that should mean)
Jul
29
revised Does expanding space cost energy?
clarified second question
Jul
29
comment Cooling down a container in outer space
i assume this should read 2.7K?
Jul
29
comment Does expanding space cost energy?
@JohnRennie i think at the heart of my question is whether space itself (the metric, i guess) is "created" at the expense of energy. I guess the answers you pointed me to should make the answer "we don't know, but most explanations don't assume it"? I guess asking whether there are models in which space and energy are interchangeable or the same thing, as mass and energy, should be a seperate question.
Jul
29
comment Does expanding space cost energy?
@JohnRennie looking at two different questions and their answers, i found one that i thought said the energy goes to the "dark energy", while another said it was going into the energy of the gravitational field. Is that related or am i mixing unrelated things here?
Jul
29
asked Does expanding space cost energy?
Jul
23
comment Could one measure a stick to an arbitrary precision by having its length estimated by enough people?
Does the fact that people will probably only estimate the discrete mm steps change anything? Since that's not really normally distributed?! Assuming people do not just round the real length, which would break the question immediately.