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The Local Interstellar Cloud is supposed to be around 30 light years large. Is it possible that in this region there are stars which are undetected? I would have thought that it wasn't possible, but there are stars which are very small or are very close to another star. BTW, with star I mean an astronomical object which is performing fusion, because I've seen lists of smallest or coldest stars which includes brown dwarfs which don't perform fusion or white dwarfs.

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    $\begingroup$ "There are known unknowns and then there are unknown unknowns." In this case, it's not only possible but almost a dead certainty. $\endgroup$ – Carl Witthoft Feb 27 '19 at 18:52
  • $\begingroup$ Is there a blurry limit where you can be sure there arent undetected stars , due to gravitational forces effects, luminosity or whatever? $\endgroup$ – Pablo Feb 27 '19 at 19:52
  • $\begingroup$ What is "the local interstellar cloud"? $\endgroup$ – Rob Jeffries Feb 27 '19 at 22:47
  • $\begingroup$ According to a compatriot and colleague of yours, a small low-density interstellar cloud where the sun is located centauri-dreams.org/2010/09/01/into-the-interstellar-void $\endgroup$ – Pablo Feb 28 '19 at 0:45
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It is unlikely, unless they are extremely faint. The reason is that the cloud obviously does not absorb enough light to keep us from detecting remote red and brown dwarfs, and hence a closer star would also be detectable.

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