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A dwarf-planet candidate called UX25 and its tiny satellite could provide the first evidence of a new cosmological model that includes antigravity... The model dispenses with concepts such as dark matter, dark energy and cosmic inflation, and the astronomers say that it could be tested by observing the motion of the two objects as they move through the outer solar system.
Dwarf planet could illuminate the dark sector
So it can be tested, but hasn't been tested.
Now, Vecchiato and Gai suggest that Hajdukovic's model can be tested by using existing ground and space telescopes to observe the UX25 system – which is about 43 times farther from the Sun than is the Earth. "The properties of quantum vacuums described in Hajdukovic's theory would apply an additional [gravitational] force on UX25, perturbing the orbit of the system," Vecchiato explained to physicsworld.com.