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Galaxy Formation and Mergers


What looks like the glowing eyes of an angry cybernetic owl in this Hubble Space

Galaxy Formation May 21, 2010

Radio Programs

Green Peas Dishing up some busy little galaxies September 10, 2021

Dark Monsters Darkness from darkness July 26, 2021

Jhelum Stream Looping around the Milky Way June 18, 2021

Galactic Archaeology Digging into the history of the Milky Way June 17, 2021

IC 1101 The king of the mega-merger April 27, 2021

Galaxy Pair Stirring up a pair of spiral galaxies November 27, 2020

Andromeda III Building a galactic giant November 6, 2020

Galactic Ripples Rippling through the Milky Way September 7, 2020

Hercules Galaxies A busy cluster of galaxies July 25, 2020

The Final Parsec Bridging the final parsec June 17, 2020

Omega Centauri The remnant of a one-time galaxy June 1, 2020

Southern Pinwheel Pinwheeling across the southern sky April 28, 2020

Messier 53 Stars all around, galaxy below April 27, 2020

‘Windy’ Galaxies Busy galaxies that underperform March 25, 2020

Dwarf Galaxies Galaxies large and small March 24, 2020

Spicy Clusters Making sausage in the Milky Way November 29, 2019

Dark Mergers Fireworks from a “dark” merger August 22, 2019

Galactic Collision Heading for a galactic pile-up August 21, 2019

Merging Galaxies A messy galactic merger August 20, 2019

Hidden Galaxy A close galaxy hides from view August 1, 2019

Mergers Giant galactic mergers February 14, 2019

Ring Galaxies Beautiful galactic rings November 7, 2018

Andromeda Galaxies The orderly Andromeda galaxies October 12, 2018

Messier 30 An interloper from another galaxy October 10, 2018

Galactic Smash-Up A smash-up for some bright neighbors September 26, 2018

Black-Eye Galaxy Giving a galaxy a black eye May 13, 2018

Streamers New arrivals in the Milky Way April 3, 2018

On the Move Tugging at the Milky Way February 13, 2018

NGC 1316 Building an odd galaxy December 19, 2017

Seyfert’s Sextet Illumination in a dark sky September 28, 2017

Busy Merger A possible medium-size black hole May 10, 2017

Galaxies “Island universes” across the cosmos April 17, 2017

Local Group IV A collision course for the Milky Way January 12, 2017

NGC 1600 A plain galaxy with a dark heart December 14, 2016

More Reionization An early light in the young universe November 4, 2016

Reionization Giving the universe a charge November 3, 2016

Sunflower Galaxy Sculpting a galactic sunflower August 26, 2016

Moon and Spica An act of galactic cannibalism July 11, 2016

Large Magellanic Cloud Fireworks in a companion galaxy July 4, 2016

Biggest of the Big The biggest of the big June 28, 2016

Super Spirals Making beautiful giant galaxies April 2, 2016

Hydra I A faint companion to the Milky Way April 1, 2016

Lacy Galaxies Finding big but hazy galaxies March 31, 2016

Evaporating Galaxy A galaxy that’s ripping itself apart March 23, 2016

Black Hole Snowplow Snowplowing lanes around a black hole March 4, 2016

Whirlpool Galaxy Stirring up some hot young stars March 3, 2016

Galactoseismology Ripples from a “galaxy quake” March 2, 2016

Featured Images

Recent view of Centaurus A, a giant galaxy

Galactic Contrast September 1, 2021

Star Stream June 18, 2021

artist's concept of ID2299, a galaxy that is losing much of its gas

Losing Gas January 12, 2021

Galaxies around a supermassive black hole in the early universe

Entwined in a Dusty Web October 1, 2020

Hercules galaxy cluster

Galaxies Everywhere July 25, 2020

Star Factory June 15, 2020

Artist's concept of a rotating disk galaxy in the early universe

Ancient Galaxy May 26, 2020

Abell 85

Heavyweights February 10, 2020

Hubble Space Telescope view of a pair of interacting galaxies

Beautiful Collision November 4, 2019

NGC 6052

Messy Merger August 20, 2019

Galaxy Centaurus A

Loud and Clear May 23, 2019

Hubble Space Telescope view of D100, a galaxy that is losing gas as it plummets into the Coma Cluster

Running Out of Gas January 25, 2019

Hoag's Object, a ring galaxy

Galactic Ring November 7, 2018

NGC 5907

Pancake Galaxy September 30, 2018

Atoms for Peace galaxy

'Peaceful' Galaxy September 28, 2018

Magellanic Clouds over ALMA

Close Clouds September 26, 2018

Black holes around a ring galaxy

Ring Around the Galaxy September 8, 2018

the merging galaxy ngc 3256

Galactic Mash-Up June 2, 2018

Hubble Space Telescope view of spiral galaxy M64, the Black-Eye Galaxy

Galactic Black Eye May 13, 2018

The M81 Group of galaxies

Close Group March 28, 2018

Quasar 3c 298

'Pushy' Black Hole February 26, 2018

A Hubble Space Telescope view of the galaxy NGC 1316

Odd Giant December 19, 2017

Seyfert's Sextet

Four-Member Sextet September 28, 2017

Combined radio and visual view of the Perseus galaxy cluster

Hot Halo June 21, 2017

Hubble Space Telescope image of galaxy cluster Abell 370

Galactic Pile-Up May 15, 2017

sequence of images depicting the merger of M31 and Milky Way galaxies

Crash Course January 11, 2017

Ground-based view of Coma cluster of galaxies

Sparkling Galaxies March 29, 2016

Hubble view of M51, the Whirlpool galaxy, and its companion galaxy

Whirling Along March 3, 2016

Hubble view of galaxy Markarian 231

Double Double November 22, 2015

Hubble Space Telescope image of spiral galaxy Messier 66

Evidence of an Encounter April 12, 2015

Hubble Space Telescope view of Abell 2744, a massive galaxy cluster

On the Frontier March 9, 2015

Hubble image of the aftermath of a galactic collisio

Beautiful Disruption January 30, 2015