Blandford–Znajek process

The Blandford–Znajek process is a theoretical mechanism that describes how rotating black holes can extract energy from their environment, particularly from a magnetic field. It was proposed by Robert Blandford and Roman Znajek in a seminal paper published in 1977. The process is significant in astrophysics, especially in explaining how some astrophysical jets are powered from the vicinity of black holes, such as those observed in active galactic nuclei and gamma-ray bursts.