Aquarius Dwarf

The Aquarius Dwarf galaxy is an irregular dwarf galaxy. It is located within the boundaries of the constellation of Aquarius. It is a member of the Local Group of galaxies, albeit an extremely isolated one; it is one of only a few known Local Group members for which a past close approach to the Milky Way or Andromeda galaxy can be ruled out, based on its current location and velocity.

Local Group membership was firmly established on Terra in 1999 CE, with the  distance from the Milky Way of 3.2 ±0.2 Mly (980 ±40 kpc) meaning that Aquarius is quite isolated in space. It is one of the least luminous Local Group galaxies to contain significant amounts of neutral hydrogen and support to ongoing star formation, although it does so only at an extremely low level. Because of its large distance, it is difficult to study its stellar populations in detail. RR Lyrae stars have been discovered in Aquarius, indicating the existence of stars more than 10 billion years old, but the majority of its stars are much younger (median age 6.8 billion years). Among Local Group galaxies, only Leo A has a younger mean age, leading to the suggestion that delayed star formation could be correlated with galaxy isolation.