The galaxy with the lowest known mass is the "Segue 2" dwarf galaxy. It contains approximately 1,000 stars and has a radius of 34 parsecs (110.9 light years). Its luminosity is about 800 times that of the Sun (absolute visible magnitude of about −2.5), which is much lower than the luminosity of most globular clusters.

Dwarf galaxies like Segue 2 are dim and difficult to observe, so the smallest galaxy in the universe most likely has not been discovered. It was only possible for us to observe Segue 2 because it is a satellite of the Milky Way and is therefore fairly close to earth, at a distance of just 114,000 light years. For comparison, the observable universe has a radius of 93,000,000,000 light years, so it is plausible there may be galaxies that are both smaller and further away than Segue 2.
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