Galaxy
A galaxy is any of the systems of stars and interstellar matter that make up the universe. A galaxy is composed of stars, stellar remnants, interstellar gas, dust, and dark matter that are all held together by gravity.
Nature has provided an immensely varied array of galaxies, ranging from faint, diffuse dwarf objects to brilliant spiral-shaped giants.
Hubble recently captured an almost delicate beauty of a galaxy cluster
Hubble watches cosmic light bend.
A new window into dark energy
An analysis by Dark Energy Survey physicists yields more precise estimates of the average density of matter as well as its propensity to clump together - two key parameters that help physicists probe the nature of dark matter and dark energy.
Nearest star cluster to the Sun is being disrupted by our galaxy
Is the nearest star cluster to the Sun being destroyed?
Astronomers image the massive object at the center of the Messier 87 (M87) galaxy
Astronomers image magnetic fields at the edge of M87’s black hole.
Astronomers captured images of the cosmic web for the first time
First images of the cosmic web reveal a myriad of unsuspected dwarf galaxies.
Scientists mapped the location of missing baryons
Missing baryons found in far-out reaches of galactic halos.
Astronomers reported the mass segregation results of 35 Galactic Globular Clusters
Scientists explored mass segregation of galaxy globular clusters.
Scientists detected the largest supernova remnant ever
Scientists find the largest supernova remnant by looking in right place.
Streams of cold gas provisioned early, massive galaxies
The larger the galaxy, the more cold gas it needs to coalesce and grow.