Figure SEQ Figure \* ARABIC 1: (Left) The glowing pink neon gas in the Plasma Kristall-4 (PK-4) experiment. Dust is injected into the tube with the plasma. Credit: MPE–M. Kretschmer - Fink, Martin A., Markus H. Thoma, and Gregor E. Morfill., Microgravity Science and Technology 23.2 (2011): 169-171. (Top Right) Dust ordered in straight lines formed in a plasma in the PK-4 experiment; their motion is recorded by a video camera. Credit DLR/ROSCOSMOS. (Bottom Right) Computer model showing the organization of the plasma around the dust particles, represented by black dots. The charged dust attracts the ions in the plasma. Higher concentrations of ions are shown in red.