Materials(생략)
The designers of early spacecraft found it necessary to develop special material that was lightweight but also extremely strong. Since that time, this material has been used in products such as sports helmets and tennis rackets. Another important material developed for use in space is memory metal, which "remembers" its original shape after it is bent. This material can now be found in simple eyeglass frames. Also, the shock absorbing material used in the boots worn by astronauts is now found in a variety of sports shoes.
Electronics(생략)
Along with smoke detectors, quarts timing crystals were originally developed for use in early spacecraft. These crystals, which are highly stable during temperature changes, now make sure that our watches and clocks keep time accurately under any circumstances. Also, in order to list its millions of spacecraft parts, NASA developed the technology which eventually evolved into the barcode. Barcodes can now be found on goods in supermarkets and convenience stores all around the world.
CURRENT TECHNOLOGY(생략)
Cleaner Cars(생략)
Space flight researchers are constantly studying how different materials burn, and this kind of research may have a big impact on the future of earth. NASA currently uses liquid hydrogen as a fuel when launching space shuttles. Hydrogen burns more cleanly than fossil fuels, creating fewer harmful emissions. The eventual development of a hydrogen-burning engine for use in cars and other vehicles could make it possible to dramatically reduce the rate of global warming. (236 words)