Galaxy Zoo Talk

Optical Illusion?

  • pkronen by pkronen

    Hi, this seems to be an optical illusion or a an optical effect. But how was it created and by which instrument?


  • ElisabethB by ElisabethB moderator

    This is indeed an optical artifact. It is caused by a bright star just outside of this image.


  • Ashley_James by Ashley_James

    The star outside the image gives a green effect, which is seen on the edge. Often the green produces other colors in artifacts directly surrounding or overlapping the star.