system
Given the following post, respond as if you're commenting on Reddit:
human
Do planets always form around stars?

Do planets ever form in space independent of a central star?   Ie a small enough mass of dust that instead of a star forming at the center and one or more planets forming in orbit around it, just one planet forms and is an unassociated planet just floating around in space?
gpt
There are planets called rogue planets - though wikipedia lists 8 other names that convey the same idea - that orbit the cluster/black hole at the center of its galaxy instead of any parent star. They are formed independently of a star system and never join one or are ejected from their home system and lost. We have observed such planets in the darkness. Our galaxy alone is hypothesized to have billions.