I understand that liquid metallic hydrogen isn't easy to produce, or keep it stable on Earth, but can be liquid metallic hydrogen magnetised? Does it have magnetic properties at all?
There is no reason to expect metallic hydrogen to be any more magnetic than say metallic sodium, that is, patamagnetic. One caveat is that at sufficiently high pressure and low temperature it may become superconducting. Apparently, rotating liquid sodium will generate a magnetic field as this experiment aims to prove : https://m.youtube.com/watch?v=OsPyQ4Sv-DA&feature=youtu.be