These are organized by a classification scheme developed exclusively for Cosma. More…
galaxy : any of the very large groups of stars and associated matter that are found throughout the universe — Webster
Galaxy is a massive, gravitationally bound system that consists of stars and stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component tentatively dubbed dark matter. Galaxies contain varying amounts of star systems, star clusters and types of interstellar clouds. In between these objects is a sparse interstellar medium of gas, dust, and cosmic rays. Dark matter appears to account for around 90% of the mass of most galaxies. — Wikipedia
Galaxies News -- ScienceDaily News and research on the formation of galaxies. From the Milky Way to Andromeda Galaxy, see astronomy images of splendid galaxies in the universe. Read the latest research discoveries.
Astronomers discover galaxies spin like clockwork
on March 14, 2018 at 2:55 am
Astronomers have discovered that all galaxies rotate once every billion years, no matter how big they are. […]
Double or nothing: Astronomers rethink quasar...
on March 13, 2018 at 1:30 pm
Astronomers have identified nearly 200 'protoclusters,' the progenitors of galaxy clusters, in the early Universe, about 12 billion years ago, about ten times more than previously known. They also found that quasars don't tend to reside in protoclusters; but if there is one quasar in a protocluster, there is likely a second nearby. This result raises doubts about the relation between protoclusters and quasars. […]
Arrested development: Hubble finds relic galaxy...
on March 12, 2018 at 6:15 pm
Astronomers have put NASA's Hubble Space Telescope on an Indiana Jones-type quest to uncover an ancient 'relic galaxy' in our own cosmic backyard. […]
A peculiar galactic clash
on March 8, 2018 at 3:52 pm
Galaxies are not static islands of stars -- they are dynamic and ever-changing, constantly on the move through the darkness of the Universe. Sometimes, as seen in this spectacular Hubble image of Arp 256, galaxies can collide in a crash of cosmic proportions. […]
Black holes from small galaxies might emit gamma...
on February 28, 2018 at 6:41 pm
Researchers have discovered seven galaxies that could shake up what astrophysicists thought they knew about how the size of a galaxy -- and the black hole at its center -- can affect its behavior. […]