Then they dissolve into nothing, only to form as if by stealth on a different horizon, dancing across the sky in the shape of a sea horse or crescent moon.

BBC: The perfect trip: Norway

The consortium tested the practicalities of using a printer on the Moon by setting up a D-shape 3D printer, which are used to print very large house-sized structures, in a vacuum chamber with simulated lunar material.

BBC: 3D printed moon building designs revealed