No more time machines.
Turns out that many laws of physics from the Newtonian era are going to be amended/changed again.
According to new developments, due to chaos being a feature of the universe. N-body systems like 3 orbiting black holes (or any celestial objects) break time reversal symmetry.
“ When running n-body simulations, physicists sometimes return time-irreversibility in their results - in other words, running the simulations backwards doesn't get them to the original starting point.“
...
"Not being able to turn back time is no longer just a statistical argument," Portegies Zwart said. "It is already hidden in the basic laws of nature. Not a single system of three moving objects, big or small, planets or black holes, can escape the direction of time."
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I found this intriguing as it removes the notion (entirely) that time travel is possible in our universe. Forward or backwards, chaos always intervenes —entropy always wins.
Jah Bless