Relic Dwarf Galaxy Ten Times Larger than the Milky Way (Weekend Feature)


Tadpole Galaxy


“We have found a giant, exceptional relic of a disrupted galaxy,” says observational astronomer  Noah Brosch at The Florence and George Wise Observatory at Tel Aviv University, about the 2018 discovery of a disrupted galaxy resembling a giant tadpole, complete with an elliptical head and a long, straight tail, about 300 million light years away from Earth. The galaxy is one million light-years long from end to end, ten times larger than the Milky Way. 


Astronomers Find Hidden Trove of Primordial Black Holes in Dwarf Galaxies


Dwarf Galaxy Black Hole


Black holes previously hiding in plain sight have been discovered by researchers at the University of North Carolina at Chapel Hill, who have found a treasure trove of massive black holes in dwarf galaxies. 


Andromeda’s Orbiting Dwarf Galaxies – “Point to Something Profound”

Andromeda Galaxy


A string of 13 dwarf galaxies in orbit around the massive galaxy Andromeda –remnants of the population of primordial structures that coalesced to form giant galaxies like the Milky Way–are spread across a flat plane more than one million light years wide and only 30,000 light years thick –a distance so vast that they have yet to complete a single orbit. The 2016 discovery suggests that conventional ideas regarding the formation of galaxies are missing something fundamental.


Dark-Matter-Dominated Dwarf Galaxy Discovered: “Fossil of the Early Universe”


Ultra Faint Dwarf Galaxy


Our massive Milky Way Galaxy –the second-largest galaxy in the Local Group after the Andromeda Galaxy–is orbited by more than twenty dwarf galaxies that are thought to be relics of the very first galaxies in the universe, A new ultra-faint dwarf galaxy (UFD), the least luminous, most dark matter dominated, and least chemically evolved galaxies known, has been discovered at a distance of about 293,000 light years away from the Earth. 


Monster Black Hole in Tiny Galaxy Holds Clues to Their Existence in Early Universe

Supermassive Black Hole


A big step in solving the mystery of how the very biggest black holes grow has been taken by researchers using NASA’s Chandra X-ray Observatory. They identified a black hole containing about 200,000 times the mass of the Sun, buried in gas and dust in the dwarf galaxy Mrk 462. ”Future sensitive observations, using x-ray and the James Webb Space Telescope (JWST) for example, will be able to find signatures of direct collapse black holes over a wider range of masses and growth rates, and help determine whether they form the seeds of the supermassive black holes we see today,” wrote Dartmouth University astrophysicist Ryan Hickox in an email to The Daily Galaxy,


Relic Galaxies Found Untouched Across Cosmic Time

Ultra Compact Galaxy


Massive ultracompact galaxies have similar numbers of stars as our Milky Way but are confined to only a tenth the size or a thousandth the volume. They evolve in an accelerated way when compared to other galaxies in the Universe. By understanding their properties, astronomers can understand the eventual fate of all galaxies, including our own Milky Way.