M87 is quite a special black hole: It is 6 billion solar masses, it lives in a giant elliptical galaxy, and it ejects a powerful jet of plasma visible at all wavelengths.
This image shows the jet in the M87 galaxy in polarized light, as captured by ALMA. This image reveals the structure of the magnetic field along the jet. (Image credit: ALMA (ESO/NAOJ/NRAO), Goddi et al.)