Is there a way to uncolonize? I have colonized all the planets I can but recently upgraded my scanner an djust found a much better planet but cant get another for 4 levels, Can I abandon one I own and get this new one somehow?

The option to abandon a planet will be available in the next major game update, possibly within a week.
It will not be free, and will likely be available only once per day.

Thanks for playing

This feature has been released today. Your feedback is welcome, let me know if you encounter any issues using it. You will find it under the 'actions' tab.