Galaxy Zoo Talk

green mark

  • Heloh by Heloh

    What can be this green mark ? #newbie


  • ElisabethB by ElisabethB moderator

    The green mark is an artifact. Nothing special, sorry.


  • trevor_allen_faller by trevor_allen_faller

    best to put them down as optical anomalies as they are pixels


  • KWillett by KWillett scientist, admin, translator

    Yep - although in this case, since the image of the galaxy is mostly quite clear, we usually ask users to ignore the artifact (if possible) and classify the rest of the galaxy as they normally would. It's most useful to us if your clicks deal with the galaxy, and then it can be tagged here in Talk (for example) as #imageartifact or something like that.