DiskFNL.jpg

Artist impression of solar system formation.
Gemini Observatory/AURA artwork by Lynette Cook Artist impression of solar system formation. Presolar grains are tiny, solid grains of primitive solar system material that originated before the formation of the Sun. They have been found in many places, including interplanetary dust, meteorites, and even samples from the comet Wild-2 that were returned to Earth by NASA's Stardust mission.