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This picture looks like a blue smoke or a very messy spider web, but this is indeed a magnified picture of the lightest material in history. The former record holder of the lightest material is an aerogel, which NASA uses to collect dust from the comet. Its composition is 99.9% gas and the density is 1 mg per cubic centimeter. Recently, this record was defeated by ultra-light metal micro-lattice, which has a density as small as 0.9 milligrams per cubic centimeter. The emergence of aviation graphite has easily broken all existing records. Its density is only 0.2 mg per cubic centimeter, which is as light as it does not exist. Researchers at the Technical University of Hamburg and the University of Kiel in Germany have produced aerospace graphite from nano- or micro-scale hollow carbon nanotube networks. As the electron microscope image above shows, most of it is empty. If you imagine that you have grabbed a piece of aeronautical graphite in your hand, it looks like a black sponge. This sparse nature means that aerospace graphite can be restored to its original size after being compressed 1000 times. Aerospace graphite of the same quality can support 35 times more weight than aerogels. Its electrical conductivity also means it may be used as part of an ultra-light battery.