April 25, 2002 12:38 PM Subscribe
- it holds six world records for physical properties and is nicknamed 'blue smoke' for its appearance; unsurprising since it is 99.8% air. Despite being used in the NASA Stardust
and Mars Pathfinder
missions, aerogels are not a recent invention and they were first prepared in 1931
. It's also a great insulator - here are some wonderful photos
of it in action.