Feb 25
The Giant Elliptical Galaxy NGC 4406 ©
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The Giant Elliptical Galaxy NGC 4406 ©
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Markarian's Chain, part of the Virgo Cluster // Ali Alobaidly
Jellyfish Galaxy
When a lone galaxy passes through a galaxy cluster, it compresses the intergalactic gas and dust surrounding the cluster, generating a burst of star formation trailing behind the galaxy in tentacle-like columns. This digital painting depicts the view from one of these starburst trails.
The Perseus Cluster of Galaxies - August 15th, 1998.
"Here is one of the largest objects that anyone will ever see in the sky. Each of the fuzzy blobs in the above picture is a galaxy, together making up the Perseus Cluster, one of the closest clusters of galaxies. We view the cluster through the foreground of faint stars in our own Milky Way galaxy. It takes light roughly 300 million years to get here from this region of the Universe, so we see this cluster as it existed before the age of the dinosaurs. Also commonly referred to as Abell 426, the center of the Perseus Cluster is a prodigious source of X-ray radiation, and so helps astronomers explore how clusters formed and how gas and dark matter interact. The Perseus Cluster of Galaxies is part of the Pisces-Perseus supercluster of galaxies, which spans over 15 degrees and contains over 1000 galaxies."
Margaret Nazon — Galaxy Cluster [velvet with beading (glass, plastic and organic material), canvas backing, 2016]
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Progress flag colorpicked from MACS 0416 galaxy cluster with gravitationally lensed star Mothra
Astronomy Picture of the Day
2026 May 21
A Collision of Galaxy Clusters
On a dark background, galaxies are shown as fuzzy white dots. A bright blue spiral expands from the center.
Image Credit: X-ray: NASA/CXC/CfA/C. Watson et al.; Optical: PanSTARRS; Image Processing: NASA/CXC/SAO/N. Wolk and P. Edmonds
Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)
Explanation: This big beautiful spiral shines in X-ray light. It is about 20 times larger than our Galaxy. It belongs to Abell 2029, a galaxy cluster one billion light-years away. (To see only the galaxies, see 2nd image.) Galaxy clusters are the largest structures in the universe that are supported by gravity. Abell 2029 is formed by thousands of galaxies, surrounded by a huge cloud of hot gas and the equivalent of hundreds of trillions times the mass of the Sun in dark matter. The spiral is made of gas, mostly hydrogen and helium, heated to tens of millions of degrees. It was found in a recent study that used data from NASA's Chandra X-ray Observatory to show that Abell 2029 had a collision with a smaller cluster four billion years ago. The collision affected the gravitational field and caused the intracluster gas to slosh, like wine moving in a wine glass, shaping the spiral.
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Amber Straughn
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.
Galaxy cluster Abell 2813 image from JWST NIRCam (filters: F277W, F356W, F444W) with lots of bright gravitational lenses