ERB wrote (nothing but?) action-adventure fiction whereas Poul Anderson wrote that kind of fiction and a lot more. ERB's John Carter is "Sword and Science" and Anderson cleverly incorporated some sword fighting into his Dominic Flandry series.
Just as Carter died on Earth and was transported to Mars/Barsoom, Tangor dies on Earth and is transported to an extrasolar planet, Poloda, where scientists deduce that:
he has come from a planetary system beyond the range of their telescopes;
that system is probably 22,000 light years beyond an astronomical object that they call Canapa;
Canapa is identical with NGC 7006 which they say is 220,000 light years away from Earth.
How can they possibly know any of that? ERB wanted a planet at an interstellar distance from Earth so he got hold of a reference to NGC 7006 to make his point.
My challenge to a hard sf writer like Anderson would be:
rewrite ERB's Beyond The Farthest Star;
render it in better English;
deepen the characterization;
enhance the action-adventure fiction;
accept every absurdity like that stuff about NGC 7006;
devise a plausible scientific rationale for every such absurdity.
The result would be fantastic and well worth reading - like an Andersonian rationalization of Kryptonian super powers which I would also like to read.