Recently, I read a few popularized articles portraying a study and associated calculations using astronomical measurements that posits a characterization of the direction and acceleration (or velocity) of our galaxy. The researchers assert not only is our galaxy being attracted by massive concentrations of mass, but it is also being pushed, impelled, by a region as empty of mass as the massive superclusters attracting us are dense with it. They called the 'impelling' region a "dipole repeller." Here is one of the couple of articles I read, https://phys.org/news/2017-01-galaxy-space.html None of the articles presented a characterization of the 'pushing' force. Perhaps the authors of the article, to be published in Nature Astronomy, don't presume to characterize it but just argue that it exists. Though the paper has yet to appear, I wish to ask if anyone can imagine and suggest some explanation or foundation for such an entity or phenomenon.