Wake Shield Facility (WSF) was a NASA experimental science platform that was placed in low Earth orbit by the Space Shuttle. It was a 3.7 m (12 ft) diameter, free-flying stainless steel disk.
Deployment of the WSF using the Space Shuttle robotic arm, Canadarm
Epitaxy refers to a type of crystal growth or material deposition in which new crystalline layers are formed with one or more well-defined orientations with respect to the crystalline seed layer. The deposited crystalline film is called an epitaxial film or epitaxial layer. The relative orientation(s) of the epitaxial layer to the seed layer is defined in terms of the orientation of the crystal lattice of each material. For most epitaxial growths, the new layer is usually crystalline and each crystallographic domain of the overlayer must have a well-defined orientation relative to the substrate crystal structure. Epitaxy can involve single-crystal structures, although grain-to-grain epitaxy has been observed in granular films. For most technological applications, single-domain epitaxy, which is the growth of an overlayer crystal with one well-defined orientation with respect to the substrate crystal, is preferred. Epitaxy can also play an important role while growing superlattice structures.
Rutile epitaxial on hematite nearly 6 cm long. Bahia, Brazil
Rutile on hematite, from Novo Horizonte, Bahia, Northeast Region, Brazil
Hematite pseudomorph after magnetite, with terraced epitaxial faces. La Rioja, Argentina