An isolated particle ensemble in the form of a droplet observed in a fluid complex plasma. Bubbles, blobs, and cusps form spontaneously.

From the article:

Formation of Bubbles, Blobs, and Surface Cusps in Complex Plasmas
M. Schwabe, M. Rubin-Zuzic, S. Zhdanov, A. V. Ivlev, H. M. Thomas, and G. E. Morfill
Phys. Rev. Lett. 102, 255005 (2009)

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