I've been believing for some time now that the whole "Earth" or the "Tree of Knowledge" is the Milky Way galaxy.
The Book of Enoch have compelling evidence that the prophet Enoch was indeed flown around the galaxy by an Angel. He accurately described features that were only discovered recently by modern astronomy.
He mentioned our galaxy as both "Earth" and "Tree of Knowledge". Indeed, our galaxy does look like a giant tree. Other ancient cultures might have also referred to our galaxy as the "World Tree" especially by the Nordic culture.
"Earth" does not refer to this planet only but likely to our entire galaxy which accommodates innumerable stars and planets.
"Ends of the Earth" or the "Four corners of the Earth" doesn't exist in a spherical Earth but our Galaxy does have "ends" and it has four major arms. This implicates intelligent beings beyond our planet around our galaxy and they too needs to be discipled "Preach the Gospel to the ends of the Earth". Yea, at some point, we need to leave our planet to spread the Gospel to other planets.