Aerogel is the lightest and lowest-density solid known, consisting of 99.8% air and holds 15 entries in the Guinness Book of World Records, including lowest density solid and best insulator .
Aerogel has fulfilled important roles on NASA Stardust missions: spacecraft STARDUST uses aerogel to capture both cometary samples and interstellar dust from comet Wild 2 in 2004---NASA Jet Propulsion Laboratory
Aerogel has fulfilled important roles on NASA Stardust missions: spacecraft STARDUST uses aerogel to capture both cometary samples and interstellar dust from comet Wild 2 in 2004---NASA Jet Propulsion Laboratory
Caution - Silica aerogel is fragile, please handle with care!