I'm not a big fan of wikipedia. Maybe if you found an actually published article about it.
Anyway, I remember reading an article of Krauss' and maybe reading about it in his A Universe From Nothing book as well, that our galaxy would eventually be driven so far apart from other galaxies that future humans wouldn't be able to tell there's a whole universe out there, beyond their galaxy(which we thought as well at a certain point in the past, before Hubble proved there's other galaxies out there). However, Krauss was referring to a far later date in the future than 5 billion years, if I'm not mistaken.
Anyway, I remember reading an article of Krauss' and maybe reading about it in his A Universe From Nothing book as well, that our galaxy would eventually be driven so far apart from other galaxies that future humans wouldn't be able to tell there's a whole universe out there, beyond their galaxy(which we thought as well at a certain point in the past, before Hubble proved there's other galaxies out there). However, Krauss was referring to a far later date in the future than 5 billion years, if I'm not mistaken.
