VZLUSAT-1 is a technological nanosatellite for in-orbit demonstration of new technologies and products, jointly developed by several Czech partners including Czech Technical University (CTU). It is well known for its “Lobster Eye” optical system, developed by a Czech company. The detection system is based on pixel sensor Timepix, developed by the Medipix collaboration. VZLUSAT-1 was launched 23 June 2017, and is part of the QB50 international network of CubeSats for multi-point, in-situ measurements in the lower thermosphere and re-entry research.