Spirals with "Tight" spiral arms
I notice that when one classifies tight spirals, one cannot subsequently select "I can't tell how many" arms. Why not?
by Capella05 moderator
It has been intentionally left out from the classification tree 😃
The scientists feel more can be learnt from an educated guess as to how many arms a spiral galaxy has, as opposed to being able to opt out of the question. For any newbies reading this, that is not a spiral galaxy on the left 😃
by KWillett scientist, admin, translator
Yep. It doesn't depend on the type of spiral arms (tight, medium, or loose), either - we've removed it for all galaxies where our users can see the spirals. We have lots of data from previous classifications in GZ which shows that the users' best guess is much more valuable than the "don't know" option.