Abstract
Galaxies The Milky Way is orbited by numerous low-mass dwarf galaxies, which are mostly small and faint. Torrealba et al. have discovered a nearby dwarf galaxy, Antlia 2, which is faint but very large. Combining astrometric, photometric, and spectroscopic data, they determine the distance, mass, and brightness of the galaxy. Because its starlight is spread over a large region, Antlia 2 has the faintest surface brightness of any known galaxy, more than 100 times lower than previously discovered ultra-diffuse galaxies. Its peculiar properties may result from tidal interactions with the Milky Way, implying that Antlia 2 was once even larger. Mon. Not. R. Astron. Soc. 488 , 2743 (2019).
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