Out in the dark depths of space, our models of the Universe get messy. A new study looking at the ultra-diffuse dwarf galaxy AGC 114905 has revived a controversial theory (or more accurately a hypothesis) of gravity, and given us more questions than
But this team found that the galaxy's spin was extremely slow – slow enough that not only did they not need dark matter to confirm the models, but the rotation curve of the galaxy also cast huge doubt on the MOND framework. It doesn't fit with either hypothesis.
The new paper has 'un-debunked' the 2021 finding, suggesting that the issue isn't with MOND, but instead with the inclination of the galaxy itself. "Our simulations show that the inclination of AGC 114905 might be significantly less than reported, which would mean the galaxy is actually rotating much faster than people think, in line with MOND expectations,", also from the University of St Andrews.
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