No need assuming he's going to visit all those places. His interest is in people who on earth want to serve him. He's simply going to get rid of the people who do not desire to serve him on a paradise earth. It's not complicated. He sent his Son the Messiah here on Earth to teach mankind about him. John 17:3 says: This means everlasting life, their coming to know you, the only true God, and the one whom you sent, Jesus Christ.

Perhaps one day all the universe will have worshipers of Jehovah. But that for now is all speculation.

For many years Scientist cast doubt on the Bible saying that it was in error by stating that the rabbit did not chew the cud. They are guilty of turning many people away from the Bible and God with that statement. In the 40's by some accident a scientist discovered that indeed the rabbit did chew the cud. God's word was right the scientist were wrong.

Scientist believed the earth was flat from what I was taught until some time around Christopher Columbus. This is what the Bible writer Isaiah had to say long before Columbus.
Isaiah 40:22 There is One who dwells above the circle of the earth. How do you suppose that man Isaiah knew that the earth was round like a circle.

It's because all of the Bible writers were inspired by God as to what they should write. There's never been a scientist I've heard of that's ever been inspired by Jehovah. I will go with what the men who serve Jah say that are blessed with his inspiration. God's plan for mankind and the Earth makes everything else that men plan and do insignificant, if it's not in harmony with what Jehovah is going to do. He will see that their schemes all fail in his due time, not when we want it to happen. All that is expected of us is to be patient and do his will.