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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

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

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

Odd Relationship Black holes shut down starbirth December 17, 2015

Faintest Cluster A faint cluster that’s doomed October 3, 2015

More Cosmic Background Taking the universe’s temperature October 1, 2015

Omega Centauri Alien visitors from other galaxies May 25, 2015

Deep Vision Looking deep into the universe December 19, 2014

Tadpole Galaxy A tadpole swims near the dragon November 26, 2014

Galaxy Mergers When galaxies collide November 25, 2014

Three-Headed Monster A trio of giant black holes October 7, 2014

Condor Galaxy The condor stretches its galactic wings March 14, 2014

Triangulum Galaxy A galaxy that’s losing its identity November 9, 2013

Andromeda Galaxy III Building a galactic giant November 8, 2013

Coma Galaxy Cluster A brilliant cluster of galaxies April 18, 2013

The Antennae Seeing the future of the Milky Way April 15, 2013

Andromeda Starburst Brightening up a giant galaxy September 12, 2012

Collision Course Taking aim at another galaxy September 11, 2012

The Sombrero II Two galaxies for the price of one July 2, 2012

The Sombrero Looking beneath the brim of a galaxy July 1, 2012

Centaurus A A galaxy with a loud voice April 28, 2012

Galactic Streams Blending into the Milky Way March 21, 2012

Sagittarius Dwarf A galactic tug-of-war March 20, 2012

Satellite Galaxies Satellite galaxies for the Milky Way March 19, 2012