Observation of aerodynamic instability in the flow of a particle stream in a dilute gas Holly L. Capelo, Jan Moláček, Michiel Lambrechts, John Lawson, Anders Johansen, Jürgen Blum, Eberhard Bodenschatz and Haitao Xu A&A, 622 (2019) A151 Published online: 13 February 2019 DOI: 10.1051/0004-6361/201833702