How to use:

Just assign this shader to any mesh you want, sphere preferably if you want something that's resembling real moon or planet. But you can also assign it to cubes, monkeys, anything you want to make look like an asteroid. Make sure to increase Subsurf modifier levels to feel true power of displacement. If you want to make a zoom-in animation, I'd recommend subdividing manually visible regions to save you some memory and increase resolution only in areas of high focus.

To bake displacement or color texture do this:

1. Assign shader to some mesh you want to bake from.
2. UV-unwrap that mesh.
3. Create new image in the Image Editor (if you're baking displacement, make sure you check 32-bit Float option)
4. Go to Shader Editor.
5. Select Image Texture node and select newly created image from the drop-down list.
6. Connect Node Group output to an Emission Shader node (Color or Height for displacement).
7. Connect Emission Shader output to the Surface socket of Material Output.
8. Go to Render Properties and switch Device to CPU (not all GPUs can handle complex scene bake)
9. Make sure Image Texture node is selected in the Shader Editor.
10. Hit Bake!
    

Note: some GPUs may not support baking because of low available memory. That's why I recommend using CPU for baking, and GPU for image rendering.

Have fun!