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Dwarf star alloy was a material obtained from white dwarf stars. It was very expensive and very heavy. It was impregnable to any particle or radiation (TV: Day of the Moon) and was the only material that could hold time sensitive species. (TV: Warriors' Gate)
In 1969, the United States of America's military constructed a cell of dwarf star alloy in Area 51 to hold the Eleventh Doctor, though its true purpose was to give the Doctor and his friends a safehouse hidden from detection by the Silence. (TV: Day of the Moon)