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</html><thumbnail_url>https://scienceblog.com/experimentalfrontiers/wp-content/uploads/sites/7/2023/08/MOND-simulation.png</thumbnail_url><thumbnail_width>1394</thumbnail_width><thumbnail_height>543</thumbnail_height><description>For 85 years, astronomers have&#xA0;noted that there is more gravity than they can account for in the galaxies that they see, in clusters of galaxies, and in the dynamics of the whole universe. What is the invisible source of that extra attraction? Last week there was striking new evidence for a dark horse theory &#x2014; ... Read more</description></oembed>
