Here is a test sequence showing an asteroid floating thru space towards earth. It hits the Earth’s atmosphere and glows red before turning into a fireball. I used concentric spheres to model the Earth and its atmosphere. The Earth turned out ok, but the atmosphere isn’t quite right. The asteroid’s trajectory is too shallow so it skips out of the atmosphere instead of penetrating it. This was just a proof of concept to play with curve paths and camera tracking. Might try this again but using Terragen to model planet Earth instead.