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Galaxy Formation and Mergers

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

Galaxy Formation May 21, 2010

Featured Images

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
Hubble Space Telescope view of Tadpole Galaxy

Galactic Tadpole November 27, 2014
Combined visible, X-ray image of M51, the whirlpool galaxy

Colorful Whirlpool June 4, 2014
Simulation of the early universe

Tangled Web May 10, 2014
HST image of thousands of galaxies

Galaxies Galore April 17, 2014
The Condor galaxy

Night of the Condor March 15, 2014
Telescopic view of M33, the Triangulum Galaxy

Pirouetting Octopus November 10, 2013
The Antennae galaxies

Getting Together April 16, 2013
Andromeda and the Milky Way head for a galactic pile-up

Collision Course September 12, 2012
Hubble image of a pair of galaxies

Bright Companions September 7, 2012
Hubble Space Telescope view of M104, the Sombrero Galaxy

Galactic Hat Dance July 2, 2012
The remnants of two merged galaxies

Fast Exit June 18, 2012
Combined X-ray, optical, and radio view of the galaxy Centaurus A

Busy Galaxy April 29, 2012
Optical and X-ray image of the galaxy cluster Abell 383

Brilliant Darkness March 16, 2012

Galactic Swirl December 14, 2011
Radio image of the Antenna galaxies

Boundless Starbirth October 5, 2011
NGC 4438 and NGC 4435, galaxies in Virgo

Beautiful Eyes August 25, 2011
NGC 3758, a system of two merging galaxies

Double Trouble June 11, 2011
NGC 7252, aka the Atoms-for-Peace galaxies

Atomic Pile-up November 20, 2010
Ground-based image of the galaxy cluster Abell 2151, in Hercules

Galaxies Galore October 1, 2010

Galactic Beauty August 11, 2010

Beautiful Triplets March 8, 2010

Radio Programs

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