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l is a usually solid structure that defines and sometimes protects space. Most commonly, a wall separates space in buildings into rooms, or protects or delineates a space in the open air. There are three principal types of structural walls: building walls, exterior boundary walls, and retaining walls. See more at Wikipedia.org...

inally an acronym for Man Out Of Space Easiest and later changed to the more professional-sounding Manned Orbital Operations Safety Equipment, was a proposed emergency "bail-out" system capable of bringing a single astronaut safely down from Earth orbit to the planet's surface.The design was proposed by General Electric in the early 1960s. The system was quite compact, weighing 200 pounds (90 kilograms) and fitting inside a suitcase-sized container. It consisted of a small twin-nozzle rocket motor sufficient to deorbit the astronaut, a mylar bag six feet (1.8 metres) long with a flexible quarter-inch-thick ablative heat shield on the back, two pressurized canisters to fill it with polyurethane foam, and a parachute, radio equipment and a survival kit. The astronaut would leave his vehicle in a space suit, climb inside the plastic bag, and then fill it with foam. The bag had the shape of a blunt cone, with the astronaut embedded in its base facing outward. The rocket pack would protrude from the bag and be used to slow the astronaut's orbital momentum enough so that he would reenter Earth's atmosphere, and the foam-filled bag would act as insulation during the subsequent aerobraking. Finally, once the astronaut had descended to 30,000 feet (9 km) where the air was sufficiently dense, the parachute would automatically deploy and slow the astronaut's fall to 17 mph (7.6 metres per second). The foam heat shield would serve a final role as cushioning when the astronaut touches down, and as a flotation device should he land on water. The radio beacon would guide rescuers. See more at Wikipedia.org...