New observational study finds galaxy clusters obey the inverse square law across hundreds of millions of light-years, the largest scale test of Newtonian gravity yet.
Key Takeaways
Galaxy clusters at cosmological distances conform to the inverse square law, extending its empirical validity far beyond prior tests.
This is framed as the biggest-ever test of Newton’s law of gravity by scale.
The result constrains alternative gravity theories that predict deviations at large distances.
No deviation from the inverse square law was detected across the measured range.
