The Phoenix dwarf galaxy, discovered in 1976, was originally mistaken for a globular cluster. At a distance of 1.4 million light years from Earth, it is, in fact, a dwarf galaxy, but one that defies easy classification. According to the European Southern Observatory, it does not contain enough mass for build new stars, but a cloud of nearby gas, presumably ejected by supernova explosions, seems to suggest relatively recent star formation and the presence of relatively young suns. The gas does not reside within the galaxy, but it is gravitationally connected, indicating it eventually will fall back into the dwarf. This image was captured by ESO’s Very Large Telescope using the visual and near ultraviolet FOcal Reducer and low dispersion Spectrograph, or FORS2, instrument.
A dwarf galaxy discovered close to the famous Sculptor Galaxy (NGC 253) by Australian astrophotographer Michael Sidonio has been studied in detail by the 8-metre Subaru Telescope in Hawaii. This fruitful collaboration between amateur and professional astronomers has revealed that the dwarf galaxy, now known as NGC 253-dw2, is being disrupted by the nearby giant spiral.
The fuzzy collection of stars seen in this NASA/ESA Hubble Space Telescope image forms an intriguing dwarf galaxy named LEDA 677373, located about 14 million light-years away from us in the constellation Centaurus. This particular dwarf galaxy contains a plentiful reservoir of gas from which it could form stars, but it stubbornly refuses to do so. Why?