Worldbuilding.

[Catsmate]

This page has an interesting collection of planets and useful resources for worldbuilding. Included are a future CO₂ blighted Earth terraformed Mars and Venus and numerous variations of Earth.

I'm planning to set a future ^eDoctor adventure on a terraformed Venus, based on one of these, set centuries in the future after the Venusian Terraforming Project has rendered the planet inhabitable for baseline humans. Despite the delays caused by the Martian War and the Thalek invasion and the Reconstruction.

[Marnal]

These are GREAT!!! Thanks for sharing!

[Catsmate]

Thanks! It's a fascinating set, well detailed and useful.
Though they are all merely spherical.

ETA: oops I meant to link to this collection; Hellholes of the Third Imperium. While intended for the Traveller RPG they should be easily integrated into a Doctor Who game. Unpleasant surprised to spring on players.