 Space activities were further concentrated under the Group of Space Physics under the Academy of Sciences in 1969, which became the Central Laboratory of Space Research (CLSR) in 1974.Bulgaria became actively involved in all components of Interkosmos.Instruments were placed in Vertikal sounding rockets, several satellites of the Interkosmos series, and ground control activities were carried out in cooperation with the Soviet Union and other Communist countries of the programme.