<p>I was wondering whether it has proven whether the universe is expanding and if so, what is its ratio, one more question that whether it has an effect for the centrifugal forces, i.e gravity and the weight of the planets and far- away stars. Many thanks.</p>

CC BY-SA 3.0
2018-01-13T21:04:21.907Z
I don't understand much of this. What do you mean by "ratio"?  What do you mean by "centrifugal forces ie gravity"? Gravity isn't a centrifugal force. By "weight" do you mean "mass"?  How do you think expansion might affect mass? You have tagged "star" and "milky-way"  How is this question about stars or the milky-way? Don't comment; please [edit].
James K
CC BY-SA 3.0
2018-01-13T22:24:08.040Z
Do you mean "what is its _rate_", perhaps?
pela
CC BY-SA 3.0
2018-01-13T23:06:59.957Z
If I understand your question, the answer is that expansion doesn't affect gravity or other factors, because expansion of space doesn't apply over short distances.   Space expands, objects in space aren't affected, it's the space between objects that expands - and, again, only over very large distances.   Space doesn't expand between the Earth and the Sun, for example at least, not in any meaningful way.  It certainly doesn't expand within the Earth.
userLTK
CC BY-SA 3.0
2018-01-14T01:09:28.623Z
The speed of the expension is the Universe is measured by the so-named Hubble-constant. Its value is around $70 \frac{km}{s}$ for every 100 Megaparsec. Thus, anything 100 MPc away, is receding with $70 \frac{km}{s}$ from us. Currently there is no evidence that gravity would change in time. Of course things more far away attracts eachother lesser.
peterh
CC BY-SA 3.0
2018-01-14T01:36:31.533Z
It's accepted now that the universe is expanding and [this Wikipedia page discusses the reason and evidence](https://en.wikipedia.org/wiki/Metric_expansion_of_space).
StephenG - Help Ukraine
CC BY-SA 3.0
2018-01-14T12:10:52.370Z
Many thanks for the answers, which helped me a lot! I have then found this new study, that at least Planet Earth is not only being spun or levitate by the power of its magnetic field, which has a paramagnetism field; stunning; making the look-alike example;  i.e gravity ( everything must be a sort of a Magnetic Field, I meant), So will the planets get thrown away little by little or not is the ( centrifugal force) being weakened? https://youtu.be/7CzCDR0nv5g  please notice the statement there is no negative or positive magnetic field at this video, time: 8.52.
Mohammad Taksayeh
CC BY-SA 3.0
2018-01-14T12:12:56.893Z
Dear Pela, yes I did mean rate.
Mohammad Taksayeh
<star><astrophysics><milky-way>
Modern Astrophysics
Mohammad Taksayeh
# Modern Astrophysics

(Asked by: username_0 on 2018-01-13)

I was wondering whether it has proven whether the universe is expanding and if so, what is its ratio, one more question that whether it has an effect for the centrifugal forces, i.e gravity and the weight of the planets and far- away stars. Many thanks.

**Tags:** star, astrophysics, milky-way
> **Comments:**
> **username_1**: I don't understand much of this. What do you mean by "ratio"?  What do you mean by "centrifugal forces ie gravity"? Gravity isn't a centrifugal force. By "weight" do you mean "mass"?  How do you think expansion might affect mass? You have tagged "star" and "milky-way"  How is this question about stars or the milky-way? Don't comment; please [edit].  
> **username_2**: Do you mean "what is its _rate_", perhaps?  
> **username_3**: If I understand your question, the answer is that expansion doesn't affect gravity or other factors, because expansion of space doesn't apply over short distances.   Space expands, objects in space aren't affected, it's the space between objects that expands - and, again, only over very large distances.   Space doesn't expand between the Earth and the Sun, for example at least, not in any meaningful way.  It certainly doesn't expand within the Earth.  
> **username_4**: The speed of the expension is the Universe is measured by the so-named Hubble-constant. Its value is around $70 \frac{km}{s}$ for every 100 Megaparsec. Thus, anything 100 MPc away, is receding with $70 \frac{km}{s}$ from us. Currently there is no evidence that gravity would change in time. Of course things more far away attracts eachother lesser.  
> **username_5**: It's accepted now that the universe is expanding and [this Wikipedia page discusses the reason and evidence](https://en.wikipedia.org/wiki/Metric_expansion_of_space).  
> **username_0**: Many thanks for the answers, which helped me a lot! I have then found this new study, that at least Planet Earth is not only being spun or levitate by the power of its magnetic field, which has a paramagnetism field; stunning; making the look-alike example;  i.e gravity ( everything must be a sort of a Magnetic Field, I meant), So will the planets get thrown away little by little or not is the ( centrifugal force) being weakened? https://youtu.be/7CzCDR0nv5g  please notice the statement there is no negative or positive magnetic field at this video, time: 8.52.  
> **username_0**: Dear Pela, yes I did mean rate.  

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## 0 answers

