Dust Particles (IMAGE) University of Copenhagen - Niels Bohr Institute Caption This is an electron microscope image of dust particles from interstellar space. The dust particles are typically about 100 nanometers (one nanometer is one millionth of a millimeter) and are made up of either carbon (soot) or silicates (fine sand). Credit (Credit: A. Takigawa/R. Stroud/ L. Nittler) Usage Restrictions (Credit: A. Takigawa/R. Stroud/ L. Nittler) 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.