Voyager 2 recently left the solar system and registered an increase in plasma density. If light moved slower in this dense plasma, would it appear like events in other solar systems played out slower than they actually do?
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$\begingroup$ "dense" is a relative word here. The interplanetary plasma is still a very very good vacuum, compared to most vacuums created on Earth. $\endgroup$ – James K Dec 14 '19 at 8:27
