Particle Tracks in Aerogel
Jet Propulsion Laboratory https://www.jpl.nasa.gov/ Nov. 3, 2005
In an experiment using a special air gun, particles are shot into aerogel at high velocities. Closeup of particles that have been captured in aerogel are shown here. The particles leave a carrot-shaped trail in the aerogel. Aerogel was used on the Stardust spacecraft to capture comet particles from Comet Wild 2.