Caleidoscope
Newton’s law of gravity passes its biggest test ever
07.05.2026
Galaxy clusters obey the inverse square law across hundreds of millions of light-years
More than 3 centuries after Isaac Newton proposed his law of gravity, cosmologists have confirmed it using the largest objects in the universe. Newton’s famous inverse square law had long been verified in laboratory experiments and within the Solar System. The new study, published last month in Physical Review Letters, extends the law to the largest scales possible: galaxy clusters separated by hundreds of millions of light-years.
“We know it holds incredibly well terrestrially and within individual...
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