What Do Aliens Look Like?

Under such extreme and unrelenting environment, there’d be nothing but hardy, microbial life, the kind of bacteria we find living inside solid icebergs on Earth.

They may grow by a very exotic form of energy, not by absorbing sunlight.

We do find on earth bacteria that have joined end to end to create biological wires and on an alien ice world, you might have long fibers of bacteria all joined together to create vast networks of biological circuitry to extract energy from the magnetic field.