I now have a handle on making the shapes with stoneware. The porcelain vases take extra time. I use a groggy red stoneware which I keep slightly on the dry side. It requires more strength when I pinch it, but I love the cracks. Rules are meant to be broken. I pinch two shapes and then put them together. I then spend a long time making sure the shape is round and pleasant. I imagine it finished. Since most of these moons have an uneven shape, the pinching technique is perfect for this project. 

---

Tethys is Saturn's fifth largest moon. It was discovered on March 21st 1684 by Giovanni Cassini. It's tidally locked with Saturn: the same side always faces it. Its surface is cratered, but not as heavily as other moons, although it does have one very big impact crater.