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M - sigma relation between SMBHs and the velocity dispersion of the globular cluster systems

M 2-9: moving dust in a fast bipolar outflow.

M 31 and a Brief History of Dark Matter

M 33 X-7: ChASeM33 reveals the first eclipsing black hole X-ray binary

M 43 - an emission nebula in Orion

M 54 + Sagittarius = omega Centauri

M 67: an Exhibitor of Metal Abundant Core Helium-Burning Stars

M 82 and the minimum energy assumption for magnetic fields of galaxies

M 82's stellar bar

M 87 as a misaligned synchrotron-proton blazar

M Dwarf Flares from Time-Resolved SDSS Spectra