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Hello!
Welcome to Fearghall's Factorio Friday Facts! (FFFF, if you will.)
Over the last few months, you have seen asteroids a few times as a background part of some other FFFs, but for all their understated majesty, they were actually quite a complicated trick to pull off! Come with me as I take you on a 3720 to 1 journey through this asteroid field.
Asteroids do concern me
We first started with placeholder asteroids that were just the same as any other sprite - a 2D pre-rendered image with lights and shadows as part of it. This worked, but it looked pretty weird that the asteroids were all orientated the same direction, and only moved in the XY plane without rotating.
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Early placeholder asteroids by v453000
So rotation is something that we were talking about going into the asteroid design process.