Ursula is an asteroid 216 kilometers in diameter. It will need to be hollowed out to create a terrarium.

Each one of Renee’s 3,021 followers can have 7.15 hectares of land on the inside surface.

That’s the population density of

One year on Ursula lasts 2,018 Earth days.

One day on Ursula lasts 4 minutes.

That creates a centrifugal force of 9.50 gees on the interior.

Decrease the speed of rotation to 11 minutes for Earth-like gravity.