[U-238]

I believe hat story is about planets ejected from the Milky Way. These are planets that are within the interstellar medium wandering in the Milky Way

[SunkenCiv]

Thanks, and from the FRchives:

• Many Solar System Comets May Be Sun's Stolen Goods
• The Lost Siblings of the Sun
• How Many Loose Planets in the Milky Way?
• 160 billion planets in the Milky Way?!
• When Stars Play Planetary Pinball
• When straying Jupiter went on the pull