Impact detection

[Stevevolution]

Ok. My knowledge of C++ is pretty basic and I am still learning.
Would it be possible to detect impact with or landing on planet surfaces? Currently, you just fly through a planet if it is in the way.
I realise there would be no data for the 'surface' of the planet, but I just wondered if anyone had tried it.
Thanks

[selden]

Celestia does not do collision detection. I suspect it's unlikely to be added to the code base. However, you might be able to implement a LUA module to do the equivalent, depending on what you're trying to accomplish.