<p>They would be enormously difficult to observe, but with a big enough <a href="http://www.universetoday.com/121961/how-do-stars-go-rogue/" rel="nofollow">gravitational assist</a> a rogue planet certainly could be ejected from a galaxy and become a "double rogue" so to speak, or intergalactic rogue planet is probably a better term.  Rogue (or intergalactic) stars have been observed.  <a href="https://en.wikipedia.org/wiki/Intergalactic_star" rel="nofollow">Here</a> and <a href="http://www.sciencemag.org/news/2014/11/rogue-stars-outside-galaxies-may-be-everywhere" rel="nofollow">Here</a>.  The same gravitational forces that create intergalactic stars absolutely should create inter-galactic rogue planets and in fairly significant numbers.  The merging of 2 galaxies should create millions of them.</p>

CC BY-SA 3.0
2016-06-17T07:21:23.603Z
2016-06-17T07:59:20.700Z
2016-06-17T07:59:20.700Z
userLTK
<p>There is no reason why it couldn't, though the chances of it happening are small. There are hyper velocity stars that are not gravitationally bound to the Milkyway, if a planet is ripped away from its star due to a close encounter with another star or black hole it could be given enough velocity to reach a galaxies escape velocity (about 537 km/s).</p>

CC BY-SA 3.0
2016-06-17T07:25:03.627Z
2016-06-17T07:25:03.627Z
James Screech
<p>As we know, rogue planets don't orbit around a star, how about galaxy? Can a rouge planet not orbit around a galaxy?</p>

<rogue-planet>
Can a rogue planet neither orbit around a star nor a galaxy?
Gstestso
# Can a rogue planet neither orbit around a star nor a galaxy?

(Asked by: username_0 on 2016-06-17)

As we know, rogue planets don't orbit around a star, how about galaxy? Can a rouge planet not orbit around a galaxy?

**Tags:** rogue-planet

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## 2 answers

### Answer by username_1 on 2016-06-17. Score: 3 | Accepted answer

They would be enormously difficult to observe, but with a big enough [gravitational assist](http://www.universetoday.com/121961/how-do-stars-go-rogue/) a rogue planet certainly could be ejected from a galaxy and become a "double rogue" so to speak, or intergalactic rogue planet is probably a better term. Rogue (or intergalactic) stars have been observed. [Here](https://en.wikipedia.org/wiki/Intergalactic_star) and [Here](http://www.sciencemag.org/news/2014/11/rogue-stars-outside-galaxies-may-be-everywhere). The same gravitational forces that create intergalactic stars absolutely should create inter-galactic rogue planets and in fairly significant numbers. The merging of 2 galaxies should create millions of them.


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### Answer by username_2 on 2016-06-17. Score: 3

There is no reason why it couldn't, though the chances of it happening are small. There are hyper velocity stars that are not gravitationally bound to the Milkyway, if a planet is ripped away from its star due to a close encounter with another star or black hole it could be given enough velocity to reach a galaxies escape velocity (about 537 km/s).


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