<p>My impression is that, aside from the very rare galaxy that is moving towards us, only stuff inside the local galactic gravitational field can be blueshifted.  Written perhaps more clearly,  from <a href="https://www.spaceanswers.com/deep-space/where-did-the-first-particles-of-light-come-from/" rel="nofollow noreferrer">spaceanswers</a> , </p>

<blockquote>
  <p>Andromeda is not the only galaxy to be moving towards us. With the
  help of galaxy surveys, astronomers have found that around 100
  galaxies are moving towards us. Compared to the numbers of galaxies
  that we know of (hundreds of billions), blue-shifted galaxies are
  seemingly quite rare. Those that are moving towards us are either part
  of our Local Group, which means that we are gravitationally connected
  to each other, or they are found in the Virgo Cluster which everything
  in our Local Group is moving towards. The galaxies M90, M86 and M98
  are all in the Virgo Cluster and all show blue shifts.</p>
</blockquote>

CC BY-SA 4.0
2019-03-05T09:50:29.777Z
So does that mean all those 'superclusters' and 'great wall', 'Laniakea', 'filaments' are just fancy stuffs? I mean, knowing the structure of the universe is really cool - I love it too - but it doesn't have practical use because we can never reach redshifted galaxies.
longtry
CC BY-SA 4.0
2019-03-05T10:23:08.767Z
@longtry besides that is already difficult to travel within the solar system, it is not clear unless shifting to scifi what a practical use of cosmology should be. In an expansion scenario one can indeed conceive future beings let with a star and a big,even more mysterious than now, black space, and nothing else to study. They will have no clue of expansion, even, or perhaps think of being the centre of an otherwise empty expanding bubble.
Alchimista
CC BY-SA 4.0
2019-03-06T15:20:50.123Z
We'll only have stuffs of the Virgo cluster to 'play' with. It's ok in general, but it didn't answer my original question of what the furthest not redshifted object is?
longtry
CC BY-SA 4.0
2019-03-09T15:24:40.280Z
The Virgo Cluster as a whole is redshifted, and most individual galaxies in the cluster have redshifts. Some galaxies in the cluster are moving fast enough within the cluster, in directions towards us, that the combination of (Doppler) blueshift from their local (peculiar) velocity and cosmological redshift (from the expansions of space between us and the cluster) results an overall blueshift.
Peter Erwin
CC BY-SA 4.0
2019-03-04T18:35:19.383Z
2019-03-04T18:35:19.383Z
Carl Witthoft
<p>Is it also roughly the limit where gravity will be able to overcome space expansion? In other words, we can only hope to get to there, or at least see them, in the very far future?</p>

CC BY-SA 4.0
2019-03-04T17:52:15.670Z
Isn't the fact that there are  galaxy blue shifted relevant to your question?
Alchimista
CC BY-SA 4.0
2019-03-05T09:47:03.103Z
I don't really get what you meant, sorry.
longtry
CC BY-SA 4.0
2019-03-05T10:10:41.757Z
Sorry I took " to" for "in" in title. That is why I was concerned about why you didn't think extragalactic stuff into account.
Alchimista
CC BY-SA 4.0
2019-03-06T15:22:01.907Z
It's ok. Now that it's clearly understood, do you happen to know the answer to that question? It's been bugging me...
longtry
CC BY-SA 4.0
2019-03-06T16:21:36.253Z
No but I am surprised that you cannot find some listed.
Alchimista
CC BY-SA 4.0
2019-03-06T16:34:51.607Z
http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=m+98&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES try to dig around here.  For instance light from M98 is blue shifted. It is already far away as compared to Andromeda :)
Alchimista
CC BY-SA 4.0
2019-03-07T09:06:02.227Z
thank you. However, m98 is mentioned in Carl's answer already, and at redshift of -0.000474 I guess there must be quite several objects with lower numbers. Like, -0.0000003, for example. That NED link is nice, but my browser keeps saying 'the connection is insecure' when I try to search for parameter 'redshift less than 0'.
longtry
CC BY-SA 4.0
2019-03-07T09:11:01.540Z
Connection insecure started to appear for almost all sites emanating from universities, in my case and lately. I guess that not being in business they are late with some kind of protocols. Just a guess.
Alchimista
<galaxy>
What is the farthest blueshifted object to our galaxy?
longtry
# What is the farthest blueshifted object to our galaxy?

(Asked by: username_0 on 2019-03-04)

Is it also roughly the limit where gravity will be able to overcome space expansion? In other words, we can only hope to get to there, or at least see them, in the very far future?

**Tags:** galaxy
> **Comments:**
> **username_1**: Isn't the fact that there are  galaxy blue shifted relevant to your question?  
> **username_0**: I don't really get what you meant, sorry.  
> **username_1**: Sorry I took " to" for "in" in title. That is why I was concerned about why you didn't think extragalactic stuff into account.  
> **username_0**: It's ok. Now that it's clearly understood, do you happen to know the answer to that question? It's been bugging me...  
> **username_1**: No but I am surprised that you cannot find some listed.  
> **username_1**: http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=m+98&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES try to dig around here.  For instance light from M98 is blue shifted. It is already far away as compared to Andromeda :)  
> **username_0**: thank you. However, m98 is mentioned in Carl's answer already, and at redshift of -0.000474 I guess there must be quite several objects with lower numbers. Like, -0.0000003, for example. That NED link is nice, but my browser keeps saying 'the connection is insecure' when I try to search for parameter 'redshift less than 0'.  
> **username_1**: Connection insecure started to appear for almost all sites emanating from universities, in my case and lately. I guess that not being in business they are late with some kind of protocols. Just a guess.  

---

## 1 answers

### Answer by username_2 on 2019-03-04. Score: 3

My impression is that, aside from the very rare galaxy that is moving towards us, only stuff inside the local galactic gravitational field can be blueshifted. Written perhaps more clearly, from [spaceanswers](https://www.spaceanswers.com/deep-space/where-did-the-first-particles-of-light-come-from/) ,

> Andromeda is not the only galaxy to be moving towards us. With the
> help of galaxy surveys, astronomers have found that around 100
> galaxies are moving towards us. Compared to the numbers of galaxies
> that we know of (hundreds of billions), blue-shifted galaxies are
> seemingly quite rare. Those that are moving towards us are either part
> of our Local Group, which means that we are gravitationally connected
> to each other, or they are found in the Virgo Cluster which everything
> in our Local Group is moving towards. The galaxies M90, M86 and M98
> are all in the Virgo Cluster and all show blue shifts.

> **Comments:**
> **username_0**: So does that mean all those 'superclusters' and 'great wall', 'Laniakea', 'filaments' are just fancy stuffs? I mean, knowing the structure of the universe is really cool - I love it too - but it doesn't have practical use because we can never reach redshifted galaxies.  
> **username_1**: @longtry besides that is already difficult to travel within the solar system, it is not clear unless shifting to scifi what a practical use of cosmology should be. In an expansion scenario one can indeed conceive future beings let with a star and a big,even more mysterious than now, black space, and nothing else to study. They will have no clue of expansion, even, or perhaps think of being the centre of an otherwise empty expanding bubble.  
> **username_0**: We'll only have stuffs of the Virgo cluster to 'play' with. It's ok in general, but it didn't answer my original question of what the furthest not redshifted object is?  
> **username_3**: The Virgo Cluster as a whole is redshifted, and most individual galaxies in the cluster have redshifts. Some galaxies in the cluster are moving fast enough within the cluster, in directions towards us, that the combination of (Doppler) blueshift from their local (peculiar) velocity and cosmological redshift (from the expansions of space between us and the cluster) results an overall blueshift.  

---

