the atmosphere of the Sun, which is too hot to allow atoms to build up into more complex molecules. These solid fragments of matter are then injected into the interstellar medium by radiation pressure. Hence, particles bearing the signature of stellar nucleosynthesis provide information on (i) condensation processes in red giant atmospheres, (ii) radiation and heating processes in the interstellar medium, and (iii) the types of particles that carried the elements of which we are made, across the galaxy to our Solar System. See also Circumstellar dust Cosmic dust Cosmochemistry Extraterrestrial diamonds Extraterrestrial materials Glossary of meteoritics Interplanetary dust cloud List of meteorite minerals References External links Presolar grain research Presolar grains in meteorites Moving Stars and Shifting Sands of Presolar History Presolar Grains in Meteorites: An Overview and Some Implications Cosmic dust Interstellar media Meteorite mineralogy and petrology Meteorite minerals Nucleosynthesis