I don't see lag as being a problem. I mean, I'm not using emitters or anything. I got aprox. 300 FPS with the current build which now includes full sized earth map.
Anyway, heres an update.
I have made a 'dedicated' map which I am now calling "The planets" for now.
It has a space skybox which I think came with the forest map. I'd rather spend time making a playable map than making new skyboxes. Full credit for sky goes to him/her.
Earth now has a temporary green and blue texture in place for the inside and out. These will be upgraded later when someone makes one or shows me how.
Spawn point has been moved and sized to have players spawn on earth.
Features to come soon...
>Moon. Same as earth but smaller and has no atmosphere. Will hopefully have a gravity modifier.
>Sun. Using TGE sun thing
>Other planets.
>Asteroids
>Making planets build-on-able.
>Better textures
>Terrain features. Mountains, craters, caves ect.
I'm uploading a video showing the first version soon.
Also, if BS sees this, please move it to mapping discussion section please as this has turned into a project and is no longer a suggestion. :)