re: Can oceans exist in space?
Comets often have huge masses, exist in interstellar space, and hold together just fine. But they are granular ice. Perhaps if the granules were hard enough not to fuse to each other it might have the feel of liquid. If you've ever stuck your arm into a bin of polyethylene resin pellets, after outdoor winter storage, you will get a feel for what I mean. Feels just like sticking your hands in a bucket of cold water, only it's not liquid.