Thanks for the great advice, guys.

It was indeed a resolution problem after all. My 3D container was 300 x 20 x 20 and the resolution was 100 x 16 x 16 which seemed like a lot but, relatively speaking, was very low. My plan is to make the container much smaller (80 x 20 x 20) with a 3x resolution. I will animate the movement of the container as the meteor moves.

I'll post the results soon.