Ghost Galaxy NGC 2915 . ... Credit Copyright: G. R. Meurer ( Johns Hopkins U. ), C. Carignan (U. Montreal), S. Beaulieu and K. Freeman (MSSSO), Radio Image: ATCA , Optical Image: AAT Explanation: How do you find a nearly invisible galaxy? ... In visible light, shown above in yellow, this galaxy appears to be a normal dwarf galaxy , as indicated by the yellow smudge in the image center. Yet when imaged in a very specific color, shown in blue, a whole spiral galaxy appears. ...