Aerogel 99.98% air by volume solid. ☁️

#Repost///@erikbergrin: This is so cool. I’ve been wanting to see this in person. This is a sample of Aerogel, the worlds lightest solid material composed of 99.98% air by volume. A solid but extremely low density ultralight material in which the liquid component for the gel was replaced by a gas. Brought to you by one of my idols @neildegrassetyson and his podcast @startalk