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![Physics: Lawrence Livermore National Lab in Livermore, California. Nova Laser. The Nova laser is the worlds most powerful, and is being used to initiate nuclear fusion reactions. Nuclear fusion is the joining of the nuclei of deuterium and tritium (heavy isotopes of hydrogen). The reaction produces vast amounts of energy, but requires an initial temperature of 100 million Celsius. To achieve this, a pinhead-sized pellet of fuel is placed in the chamber. The Nova laser is focused onto the pellet before a full- power burst is fired. This lasts only 50 picoseconds (trillionths of a second), but gives sufficient energy for fusion to occur. [1989]](https://m.psecn.photoshelter.com/img-get2/I00005dEfUMmD128/fill=/fit=180x180/I00005dEfUMmD128.jpg)
![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)
![Physics: Lawrence Livermore National Lab in Livermore, California. Nova Laser. The Nova laser is the worlds most powerful, and is being used to initiate nuclear fusion reactions. Nuclear fusion is the joining of the nuclei of deuterium and tritium (heavy isotopes of hydrogen). The reaction produces vast amounts of energy, but requires an initial temperature of 100 million Celsius. To achieve this, a pinhead-sized pellet of fuel is placed in the chamber. The Nova laser is focused onto the pellet before a full- power burst is fired. This lasts only 50 picoseconds (trillionths of a second), but gives sufficient energy for fusion to occur. [1989]](https://m.psecn.photoshelter.com/img-get2/I0000ENNMQSvDl6w/fill=/fit=180x180/I0000ENNMQSvDl6w.jpg)
