Particle aggregation in microgravity: Informal experiments on the International Space Station
Article first published online: 22 MAR 2014
© The Meteoritical Society, 2014.
Meteoritics & Planetary Science
Volume 49, Issue 5, pages 732–739, May 2014
How to Cite
Love, S. G., Pettit, D. R. and Messenger, S. R. (2014), Particle aggregation in microgravity: Informal experiments on the International Space Station. Meteoritics & Planetary Science, 49: 732–739. doi: 10.1111/maps.12286
- Issue published online: 19 MAY 2014
- Article first published online: 22 MAR 2014
- Manuscript Accepted: 22 FEB 2014
- Manuscript Received: 7 NOV 2013
We conducted experiments in space to investigate the aggregation of millimeter- and submillimeter-sized particles in microgravity, an important early step in planet formation. Particulate materials included salt (NaCl), sugar (sucrose), coffee, mica, ice, Bjurböle chondrules, ordinary and carbonaceous chondrite meteorite fragments, and acrylic and glass beads, all triply confined in clear plastic containers. Angular submillimeter particles rapidly and spontaneously formed clusters strong enough to survive turbulence in a protoplanetary nebula. Smaller particles generally aggregated more strongly and quickly than larger ones. We observed only a weak dependence of aggregation time on particle number density. We observed no strong dependence on composition. Round, smooth particles aggregated weakly or not at all. In a mixture of particle types, some phases aggregated more readily than others, creating selection effects that controlled the composition of the growing clumps. The physical process of aggregation appears to be electrostatic in nature.