The article talks about using a ferromagnetic liquid and magnetic fields to make adjustments to the surface of the mirror, so a magnetic liquid mirror is possib

The article talks about using a ferromagnetic liquid and magnetic fields to make adjustments to the surface of the mirror, so a magnetic liquid mirror is possible. Use the magnetic field to keep the mirror on the desired surface. No atmosphere in space, so there's no other use/necessity for the technology, right? And we already have proof of concept: "Today, Brousseau and buddies reveal a next generation liquid mirror that gets around these problems. The proof-of-principle mirror is just 5 cm across but sits atop a honeycomb of 91 actuators that can deform the liquid. […] And they've overcome the the non-linear control problems by superimposing a strong uniform magnetic field on top of the field created by the actuators. This has the effect of linearising the response of the liquid."