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Guide to classifying galaxies

This photo gallery of examples of different classifications aims to provide a bit of insight into the classification process.

Galaxies on their own/ colliding galaxies/ messy galaxies

Colliding galaxies. Galaxy in centre has a central bulge.
Colliding galaxies. Galaxy in centre has a central bulge.
cigar yellowish
One main galaxy – cigar shaped.
bulge with star
One main galaxy with a central bulge. The green circle is a star.
blue circle
One main galaxy with no features . The red item underneath is possibly another galaxy but is not distorting the main galaxy.
yellow galaxy
One main galaxy – no features. The blue circle is a star.
which galaxy2
The galaxy to classify is the tiny one in the centre of the cross hairs. One main galaxy – no features.
what the hell galaxy
Can’t classify – colour scheme is distorted.
what is this
Can’t classify – colour scheme is distorted.
screen-star
One main galaxy – no features. The bright blob on the top left is a star.
not merging but star
One main galaxy – cigar shaped. The yellow dot is a star.
not colliding but close
Classify the galaxy in the centre of the crosshairs. The second spiral galaxy is not distorting the main galaxy.
not colliding 2
These galaxies are close, but not colliding. One main galaxy with no features.
mirrorball and galaxy
Spiral galaxy with mirrorball! This is just one main galaxy with spiral arms. The mirrorball is a distortion feature from the telescope.
messy3
Messy or irregular galaxy.
messy2
A messy or irregular galaxy.
messy
Messy or irregular galaxy.
messy pattern1
Another messy or irregular galaxy.
messy pattern
Messy or irregular galaxy.
messy patter
Messy or irregular galaxy.
messy or spiral
One main galaxy, with spiral arms and a central bulge.
messy or colliding
Very messy galaxy. Possibly galaxies colliding.
blue circle
One main galaxy with no features.

 

 

 

 

 

 

 

 

 

 

Galaxies with no features

 

blue circle
No features – blue-green oval
cigar shape
Galaxy with no features – cigar shaped.
cigar shape2
No features – cigar-shaped.
cigar shape3
Cigar-shaped galaxy with no features.
cigar yellowish
CIgar-shaped galaxy with no features.
greenish circle
Blue-green galaxy with no features.
yellowy white
Yellow-orange galaxy with no features.
single yellow galaxy
Another yellow-orange galaxy with no features.
orange circle 2
No features – yellow/orange galaxy.

 

 

 Galaxies with features

bar and bulge
Galaxy with a central bulge, bar and possibly spiral arms.
bar and spirals 2
Gorgeous galaxy with a clear central bar and sprawling spiral arms.
bar bulge spiral
This galaxy has all features – central bulge, bar and spiral arms.
bar, spiral arms
This galaxy could be classified as messy, but it could also be classified as having a central bulge and spiral arms.
bulge and spiral
Beautiful example of a central bulge and spiral arms.
bulge or not
A subtle central bulge.
bulge subtle
A subtle central bulge.
central bulge
There’s a central bulge in this cigar-shaped galaxy.
bulge sutble 2
Could be described as messy. Or a galaxy with a central bulge.
bulge3
Lovely central bulge and spiral arms.
bulge
The subtle central bulge can be seen as a thickening in the middle of the galaxy.
bulge with star
Galaxy with a central bulge – that’s the slightly brighter round ball at the centre of the cigar-shaped galaxy.
sideon bulge
Another examples of a slight central bulge in the middle of a disc-shaped galaxy seen side on.
spiral arms
Lovely spiral arms, and possibly a central bulge too.
spiral bar 2
Central bar with spiral arms.
spiral bar bulge
Another galaxy with a central bulge and spiral arms.
spiral bar
Beautiful central bar and spiral arms.
spiral, bar, bulge3
Central bar and spiral arms.
spiral, bar
Spiral arms and a central bar galaxy.
spiral, bulge, bar
Lovely galaxy with spiral arms, a central bulge and possibly a central bar as well.
spiral
Spiral arms.
sutble bulge spirals
Subtle spiral arms and central bulge.

 

 

 

 

 

 

 

 

 

Examples of fitted rings

Fitted ring
Fitted ring with one star marked
Fitted ring, no stars
Fitted ring, no stars
Ring fitted around messy galaxy
Ring fitted around messy galaxy
Ring fitted around messy galaxy
Ring fitted around messy galaxy
Ring fitted around cigar-shaped galaxy.
Ring fitted around cigar-shaped galaxy. Stars marked –  there’s no need to mark stars outside the red ring, but it won’t matter if you do.
Fitted ring
Fitted ring
Ring nicely fitted.
Ring nicely fitted.
Spiral galaxy with ring fitted around it and stars marked.
Spiral galaxy with ring fitted around it and stars marked.
spiral bulge ring fit
Ring covers the wide sprawl of the spiral arms. Many stars marked, but not the galaxy at bottom centre.