Abstract
The general assumption of galaxy formation is origin of the uneven density distribution. This is certainly the most important thing. But this alone cannot explain the diversity of galaxy shapes, especially the Hoag's Object. Here we propose that dark matter is negative matter and discuss distribution and observations of negative-dark matter in Milky Way, and quantitatively predict that the negative dark matter exists most likely between visible spiral arms. From this we may explain different shapes of various galaxies, the Hoag's Object, and the arm stability of spiral galaxies, etc. Further, we predict the presence of corresponding negative matter black holes, and possible similar cosmic mass dipole and try to explain galaxy AM 0644-741. It may estimate that the presence of galaxies made entirely of the negative matter will be 4.36 times of known galaxies. This interaction alternating between positive and negative matters, gravity and repulsion will show the complexity of galaxies and the Universe.
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