Does a star need to be inside a galaxy?

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Must a star belong to a galaxy, or could it be completely isolated?



In case it can be isolated (not belong to a galaxy), could it have a planet orbiting around it?






planets stars galaxies







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    $begingroup$
    See here: Intergalactic star
    $endgroup$
    – Thomas Fritsch
    3 hours ago










  • $begingroup$
    I imagine many/most stars in the IGM are ones that escaped the host galaxy (likely due to its companion star going supernova, see this Wiki entry).
    $endgroup$
    – Kyle Kanos
    3 hours ago
















2












$begingroup$


Must a star belong to a galaxy, or could it be completely isolated?



In case it can be isolated (not belong to a galaxy), could it have a planet orbiting around it?






planets stars galaxies







share|cite|improve this question









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  • 3




    $begingroup$
    See here: Intergalactic star
    $endgroup$
    – Thomas Fritsch
    3 hours ago










  • $begingroup$
    I imagine many/most stars in the IGM are ones that escaped the host galaxy (likely due to its companion star going supernova, see this Wiki entry).
    $endgroup$
    – Kyle Kanos
    3 hours ago














2












2








2





$begingroup$


Must a star belong to a galaxy, or could it be completely isolated?



In case it can be isolated (not belong to a galaxy), could it have a planet orbiting around it?






planets stars galaxies







share|cite|improve this question









New contributor




cooper is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$




Must a star belong to a galaxy, or could it be completely isolated?



In case it can be isolated (not belong to a galaxy), could it have a planet orbiting around it?






planets stars galaxies




planets stars galaxies






share|cite|improve this question









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cooper is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 2 hours ago









Chris

9,35772942




9,35772942






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asked 3 hours ago









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  • 3




    $begingroup$
    See here: Intergalactic star
    $endgroup$
    – Thomas Fritsch
    3 hours ago










  • $begingroup$
    I imagine many/most stars in the IGM are ones that escaped the host galaxy (likely due to its companion star going supernova, see this Wiki entry).
    $endgroup$
    – Kyle Kanos
    3 hours ago














  • 3




    $begingroup$
    See here: Intergalactic star
    $endgroup$
    – Thomas Fritsch
    3 hours ago










  • $begingroup$
    I imagine many/most stars in the IGM are ones that escaped the host galaxy (likely due to its companion star going supernova, see this Wiki entry).
    $endgroup$
    – Kyle Kanos
    3 hours ago








3




3




$begingroup$
See here: Intergalactic star
$endgroup$
– Thomas Fritsch
3 hours ago




$begingroup$
See here: Intergalactic star
$endgroup$
– Thomas Fritsch
3 hours ago












$begingroup$
I imagine many/most stars in the IGM are ones that escaped the host galaxy (likely due to its companion star going supernova, see this Wiki entry).
$endgroup$
– Kyle Kanos
3 hours ago




$begingroup$
I imagine many/most stars in the IGM are ones that escaped the host galaxy (likely due to its companion star going supernova, see this Wiki entry).
$endgroup$
– Kyle Kanos
3 hours ago










3 Answers
3






active

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$begingroup$

No, stars do not need to be inside a galaxy. It is estimated that about 10% of stars do not belong to a galaxy [1]. While most intergalactic stars formed inside a galaxy and were ejected by gravitational interactions, stars can form outside of galaxies as well [2].



We assume that such stars could have planets, just like stars in a galaxy, although no specific examples have been detected yet.



[1] "Detection of intergalactic red-giant-branch stars in the Virgo cluster", Ferguson et al. Nature 391.6666 (1998): 461.



[2] "Polychromatic view of intergalactic star formation in NGC 5291",
M. Boquien et al. A&A, 467 1 (2007) 93-106.






share|cite|improve this answer











$endgroup$





















    0












    $begingroup$

    In broad terms, stars and planets need large amounts of material to collect in a small area to form, and pretty much all of such collections of matter belong to galaxies already (they've had a long time to let gravity bring them together).






    share|cite|improve this answer








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    • $begingroup$
      They probably formed in a galaxy, but galactic collisions can pitch a lot of them out
      $endgroup$
      – zeta-band
      2 hours ago



















    0












    $begingroup$

    They probably have to be formed in a galaxy. But they can escape. There are many rogue planets that are found outside of solar systems. NASA has observed many rogue stars as well. This usually happens when galaxies collide and they throw out some of the stars. And yes, the rogue stars can have planets orbiting them






    share|cite|improve this answer








    New contributor




    S.t.r.a.n.g.e.C.h.a.r.m is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

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      3












      $begingroup$

      No, stars do not need to be inside a galaxy. It is estimated that about 10% of stars do not belong to a galaxy [1]. While most intergalactic stars formed inside a galaxy and were ejected by gravitational interactions, stars can form outside of galaxies as well [2].



      We assume that such stars could have planets, just like stars in a galaxy, although no specific examples have been detected yet.



      [1] "Detection of intergalactic red-giant-branch stars in the Virgo cluster", Ferguson et al. Nature 391.6666 (1998): 461.



      [2] "Polychromatic view of intergalactic star formation in NGC 5291",
      M. Boquien et al. A&A, 467 1 (2007) 93-106.






      share|cite|improve this answer











      $endgroup$


















        3












        $begingroup$

        No, stars do not need to be inside a galaxy. It is estimated that about 10% of stars do not belong to a galaxy [1]. While most intergalactic stars formed inside a galaxy and were ejected by gravitational interactions, stars can form outside of galaxies as well [2].



        We assume that such stars could have planets, just like stars in a galaxy, although no specific examples have been detected yet.



        [1] "Detection of intergalactic red-giant-branch stars in the Virgo cluster", Ferguson et al. Nature 391.6666 (1998): 461.



        [2] "Polychromatic view of intergalactic star formation in NGC 5291",
        M. Boquien et al. A&A, 467 1 (2007) 93-106.






        share|cite|improve this answer











        $endgroup$
















          3












          3








          3





          $begingroup$

          No, stars do not need to be inside a galaxy. It is estimated that about 10% of stars do not belong to a galaxy [1]. While most intergalactic stars formed inside a galaxy and were ejected by gravitational interactions, stars can form outside of galaxies as well [2].



          We assume that such stars could have planets, just like stars in a galaxy, although no specific examples have been detected yet.



          [1] "Detection of intergalactic red-giant-branch stars in the Virgo cluster", Ferguson et al. Nature 391.6666 (1998): 461.



          [2] "Polychromatic view of intergalactic star formation in NGC 5291",
          M. Boquien et al. A&A, 467 1 (2007) 93-106.






          share|cite|improve this answer











          $endgroup$



          No, stars do not need to be inside a galaxy. It is estimated that about 10% of stars do not belong to a galaxy [1]. While most intergalactic stars formed inside a galaxy and were ejected by gravitational interactions, stars can form outside of galaxies as well [2].



          We assume that such stars could have planets, just like stars in a galaxy, although no specific examples have been detected yet.



          [1] "Detection of intergalactic red-giant-branch stars in the Virgo cluster", Ferguson et al. Nature 391.6666 (1998): 461.



          [2] "Polychromatic view of intergalactic star formation in NGC 5291",
          M. Boquien et al. A&A, 467 1 (2007) 93-106.







          share|cite|improve this answer














          share|cite|improve this answer



          share|cite|improve this answer








          edited 1 hour ago

























          answered 2 hours ago









          ThorondorThorondor

          1,173221




          1,173221























              0












              $begingroup$

              In broad terms, stars and planets need large amounts of material to collect in a small area to form, and pretty much all of such collections of matter belong to galaxies already (they've had a long time to let gravity bring them together).






              share|cite|improve this answer








              New contributor




              physicsTom is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
              Check out our Code of Conduct.






              $endgroup$













              • $begingroup$
                They probably formed in a galaxy, but galactic collisions can pitch a lot of them out
                $endgroup$
                – zeta-band
                2 hours ago
















              0












              $begingroup$

              In broad terms, stars and planets need large amounts of material to collect in a small area to form, and pretty much all of such collections of matter belong to galaxies already (they've had a long time to let gravity bring them together).






              share|cite|improve this answer








              New contributor




              physicsTom is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
              Check out our Code of Conduct.






              $endgroup$













              • $begingroup$
                They probably formed in a galaxy, but galactic collisions can pitch a lot of them out
                $endgroup$
                – zeta-band
                2 hours ago














              0












              0








              0





              $begingroup$

              In broad terms, stars and planets need large amounts of material to collect in a small area to form, and pretty much all of such collections of matter belong to galaxies already (they've had a long time to let gravity bring them together).






              share|cite|improve this answer








              New contributor




              physicsTom is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
              Check out our Code of Conduct.






              $endgroup$



              In broad terms, stars and planets need large amounts of material to collect in a small area to form, and pretty much all of such collections of matter belong to galaxies already (they've had a long time to let gravity bring them together).







              share|cite|improve this answer








              New contributor




              physicsTom is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
              Check out our Code of Conduct.









              share|cite|improve this answer



              share|cite|improve this answer






              New contributor




              physicsTom is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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              answered 2 hours ago









              physicsTomphysicsTom

              71




              71




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              • $begingroup$
                They probably formed in a galaxy, but galactic collisions can pitch a lot of them out
                $endgroup$
                – zeta-band
                2 hours ago


















              • $begingroup$
                They probably formed in a galaxy, but galactic collisions can pitch a lot of them out
                $endgroup$
                – zeta-band
                2 hours ago
















              $begingroup$
              They probably formed in a galaxy, but galactic collisions can pitch a lot of them out
              $endgroup$
              – zeta-band
              2 hours ago




              $begingroup$
              They probably formed in a galaxy, but galactic collisions can pitch a lot of them out
              $endgroup$
              – zeta-band
              2 hours ago











              0












              $begingroup$

              They probably have to be formed in a galaxy. But they can escape. There are many rogue planets that are found outside of solar systems. NASA has observed many rogue stars as well. This usually happens when galaxies collide and they throw out some of the stars. And yes, the rogue stars can have planets orbiting them






              share|cite|improve this answer








              New contributor




              S.t.r.a.n.g.e.C.h.a.r.m is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
              Check out our Code of Conduct.






              $endgroup$


















                0












                $begingroup$

                They probably have to be formed in a galaxy. But they can escape. There are many rogue planets that are found outside of solar systems. NASA has observed many rogue stars as well. This usually happens when galaxies collide and they throw out some of the stars. And yes, the rogue stars can have planets orbiting them






                share|cite|improve this answer








                New contributor




                S.t.r.a.n.g.e.C.h.a.r.m is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                Check out our Code of Conduct.






                $endgroup$
















                  0












                  0








                  0





                  $begingroup$

                  They probably have to be formed in a galaxy. But they can escape. There are many rogue planets that are found outside of solar systems. NASA has observed many rogue stars as well. This usually happens when galaxies collide and they throw out some of the stars. And yes, the rogue stars can have planets orbiting them






                  share|cite|improve this answer








                  New contributor




                  S.t.r.a.n.g.e.C.h.a.r.m is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
                  Check out our Code of Conduct.






                  $endgroup$



                  They probably have to be formed in a galaxy. But they can escape. There are many rogue planets that are found outside of solar systems. NASA has observed many rogue stars as well. This usually happens when galaxies collide and they throw out some of the stars. And yes, the rogue stars can have planets orbiting them







                  share|cite|improve this answer








                  New contributor




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                  share|cite|improve this answer



                  share|cite|improve this answer






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                  answered 57 mins ago









                  S.t.r.a.n.g.e.C.h.a.r.mS.t.r.a.n.g.e.C.h.a.r.m

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                  566




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