Planetary atmosphere and realistic clouds in maya
Hello everyone,
I realized I made a planet Earth and clouds and atmosphere on two separate spheres, but If I approach the room with the planet, you can clearly see the two spheres (of the atmosphere and clouds) that really do not have consistency, but are simple "glass balls" (

).
How can I make the soft contours of the spheres? Or rather, how can I make it consistent, "solid" the atmosphere, as seen in this simulation on Mars? (And how to make credible the clouds?):
http://www.planetside.co.uk/terragen/tg2/mars_v14.mp4
Many many thanks!