Abstract: Method for thermal insulation of an evacuable container comprising an inner container, an outer container and a cavity disposed between the inner container and the outer container, wherein said method comprises a) using a vacuum pump to reduce a pressure in the cavity and after achieving a first value of the pressure interrupting the connection to the vacuum pump, b) subsequently making a connection from a reservoir container of the thermally insulating particulate material to a filling opening provided in the region of the cavity, c) setting the evacuable container into motion, wherein the thermally insulating particulate material flows into the cavity according to a) and the pressure in the cavity increases due to the air introduced with the thermally insulating particulate material, d) terminating the filling at a second value of the pressure by interrupting the connection from the cavity to the reservoir container, e) repeating step a), wherein the output of the vacuum pump with which the cavity is deaer

Abstract: Provided is an aircraft having a spherical body which generates buoyancy or which may generate buoyancy when filled with gas, wherein the aircraft further comprises four actuation units arranged on the surface of the body for movement of the aircraft in a translation and/or rotation through air, and at least one camera arranged on or in the surface of the body. Further provided is a method for providing optical information to a person in the environment of a flying aircraft, a method for providing optical information about an object and/or surveying of an object, a method for transmission of acoustic information and a method for observing or tracking an object.