Dust-rich outflows of evolved stars (IMAGE) Proceedings of the National Academy of Sciences Caption Dust-rich outflows of evolved stars similar to the pictured Egg Nebula are plausible sources of the large presolar silicon carbide grains found in meteorites like Murchison. Inset: SiC grain with ~8 micrometers in its longest dimension. Credit Image courtesy ESA/Hubble and NASA. Inset courtesy of Janaína N. Ávila. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.