Board Thread:Game development/@comment-33011277-20190215215152/@comment-35998649-20190215215708

See https://developer.roblox.com/articles/Weld, specifically "Welding together two existing bricks" (that sounds the most like what you're trying to do)

You could also try using a particle emitter of some sort and place that inside the sphere, although it needs an image and it may have graphical issues based on camera angle.