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 57 Lyræ (annular nebula), on the probable motion of, and the peculiarities in the focus for the planetary nebulæ and their nuclei

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

M 82 - NGC 3034

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

M 82's stellar bar

M 87 - an example of a reconfining jet

M 87 as a misaligned synchrotron-proton blazar

M = 1 instabilities in counter-rotating stellar systems

M and C stars in the central region of Omega Cen.

M and C Stars in the Central Region of Omega Cen.

M and S stars in the Magellanic Clouds

M Dwarf Atomic and Molecular Features in SDSS DR7 Spectra

M Dwarf Coronae in the Hyades: ROSAT AO-1/2 Results

M dwarf coronae in the Hyades: ROSAT AO-1/2 results.

M Dwarf Flares from Time-Resolved SDSS Spectra

M Dwarf Flares: Exoplanet Implications

M dwarf metallicities and exoplanets