Is there any tutorial for this planets cake,plz?

idk if there is a tutorial -- but you could use one piece of pvc pipe for the bottom three tiers and you'd need an elbow joint for the top tier -- secure the pvc pipe into a flange that is screwed into a nice piece of mdf board on the bottom -- then just affix plates onto the pvc to hold the cakes -- fill in the bottom i mean the underneath of each plate with candy clay to round out each orb -- might wanna make some of them out of foam or rice krispie treats --

you might wanna use some elbow joints to hold each cake plate that is holding each orb at that particular angle --

it's quite an engineering feat but you can do it -- use plumbing supplies -- best to you