There is an eternal realm that is both spiritual and invisible. Jesus said, “God is spirit.” The spiritual rules over the visible.
The spiritual realm has beings (angels, demons - fallen angels) which can apparently at times become visible.
Why can we not explain this? Because we are so unaware of the spiritual realm. Jesus was totally aware of it - He came from it, and reigns now over both the visible (temporal) world and the invisible (eternal) realms.
God sets the universe before us as something that declares - by its un-measurable dimension - His glory and power. He created it in an instant by speaking a word - and it came into being.
We are fools to not see the hand of God in His visible, created universe.
All was created by Him and for Him. John 1, Colossians 1. Earth is unique in that it was created for man - who was made “in His image”.
Both earth and man were created for what Ephesians calls “the eternal purpose”, which is to display and glorify the Lord Jesus Christ forever. For that purpose, Jesus took on flesh and became a Man - to go to the cross and die for man’s sins, and to deal a death blow (yet to be seen) over both death and sin.
He was raised from the dead to establish forever that He is Lord over both heaven and earth - forever!
My theory: all those systems out there were created to eventually be inhabited by mankind. Regular human beings will survive the apocalypse, after which they will start doing what they’ve done ever since the Garden: being fruitful and multiplying. The saints who were caught up to be with Jesus will be in charge of angel crews who will terraform those planets and make them inhabitable, and then transporting human settlers to the new worlds. Worlds without end, amen!
“We are fools to not see the hand of God in His visible, created universe.”
And why did God create billions of fools?