That the laws of physics are everywhere the same.
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The ASSUMPTION is that the laws of physics inside of Earth's MagnetoSphere are the same as those inside the Sun's HelioSphere.
The ASSUMPTION is that the laws of physics inside the Sun's Heliosphere are the same as the laws of Physics outside of it.
Have those assumptions been tested? Is the hypothesis falsifiable? Is there any emphirical data? Have there been any experiments?
Perhaps now's the time.
NASA sets out to examine Solar System's protective bubble
Voyager I and II are the only manmade objects that have ever crossed the boundry between inside the heliosphere and the outside.
When they did....certainUNEXPECTED discrepancies were noted. Perhaps it's time to find out more about it?
Hubble charts path of the Voyager probes out of the Solar System
- the data about interstellar material, magnetic fields and cosmic rays they are sending back from the edge of the Solar System, correlated with Hubble's observations, will go a long way toward telling astronomers whether the regions the Voyagers are passing through are rare or typical, as well as the nature of the interstellar medium through which the Sun travels