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![Physics: Scientist, Cynthia Alviso, with two organic aerogels. The cloudy white disc is silica aerogel, whilst the red disc is an aerogel containing fibers of an organic material. Aerogel is a new material, which has very high thermal insulation and extremely low mass. It is made by drying a water-based or alcohol-based gel in a super fluid process that prevents the gel from collapsing. The resulting block of linked microscopic fibers contains about 90% air, so is very lightweight. Aerogel is being studied as a thermal insulator and as a holding medium for nuclear fusion fuel. Photographed at the Lawrence Livermore National Laboratory, USA. MODEL RELEASED [1991].](https://m.psecn.photoshelter.com/img-get2/I0000hqbklEdXBk8/fill=/fit=180x180/I0000hqbklEdXBk8.jpg)
![Physics: A blowtorch is applied to a sample of aerogel to demonstrate its insulation properties. Aerogel is a new material, which has very high thermal insulation properties and extremely low mass. It is made by adding alcohol to a conventional silica gel to remove water. The gel is then placed in a pressure chamber, and the alcohol removed under super fluid conditions. This prevents the gel from collapsing. The resulting block of silica fibers contains about 90% air, so is very lightweight. Aerogel is being studied as an insulating material and as a holding medium for nuclear fusion fuel. Photographed at the Lawrence Livermore National Laboratory, USA. [1991]](https://m.psecn.photoshelter.com/img-get2/I00009Qa8bK.lTXQ/fill=/fit=180x180/I00009Qa8bK.lTXQ.jpg)
![Pre-flight preparation of the Kuiper Airborne Observatory (KAO). This is a converted Lockheed C-141A Starlifter aircraft, operated by NASA since 1974. Its main instrument is a 90-cm infrared telescope. The KAO can cruise at up to 12,500 meters, well above most of the atmospheric water vapor that absorbs far infrared radiation and prevents ground-based far-IR astronomy. Here, the liquid nitrogen tanks in the rear of the aircraft are being filled, venting gas producing the cloud. Liquid nitrogen is used in the cryogenics system used to maintain the temperature of the KAO's instruments to within one degree of absolute zero (-273 Celsius). NASA AMES Research Center at Moffett Field, Mt. View, California. [1992]](https://m.psecn.photoshelter.com/img-get2/I0000KcwrrBioY6o/fill=/fit=180x180/I0000KcwrrBioY6o.jpg)
