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According to this,

https://en.wikipedia.org/wiki/Intergalactic_star

Rogue stars are theorized to be the intergalactic space because of this,

The way these stars arise is still a mystery, but the most common theory is that the collision of two or more galaxies can toss some stars out into the vast empty regions of intergalactic space.

Could a planet be toss from a galaxy just like it's theorized rogue stars are?

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    $\begingroup$ First sentence of quote should tell you the answer. :-) $\endgroup$ – StephenG Jul 21 '17 at 13:48
  • $\begingroup$ A related question : How are rogue planets discovered ? $\endgroup$ – StephenG Jul 21 '17 at 22:33
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    $\begingroup$ Just curious:is there any particular reason you think a star could be ejected but a planet couldn't be? $\endgroup$ – Asher Jul 23 '17 at 16:59
  • $\begingroup$ I think not, but since I'm not an astronomer there might be things I dont understand that make it impossible and I ignore them. They are structurally different in composition, size, etc. $\endgroup$ – Pablo Jul 23 '17 at 21:30

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