Hi Dowii. Yes, it would be interesting if an alien from another planet showed up on the Earth.
Personally, I don't believe this will ever happen, primarily because something like that, IMO, is not in the Bible.
Also, because of the vastness of space, and time it would take to travel to Earth from the nearest star (assuming there was a planet near by), even at the speed of light.
Also, leaving the confines of our solar system one would encounter high radiation from other stars or star systems.
I used to let my imagination run, thinking of the vastness of the universe, with its billions and trillions of stars, and wondered if there was life---even spirit powered life, such as angels.
And, then, some years ago, a pastor-teacher pointed out something fascinating from the book of Ephesians. That believers in Christ Jesus, who are in the body of Christ, have a future in the heavenlies, to experience all the spiritual blessings He has prepared.
We are told that through the church/body "the manifold wisdom of God might now be made known to the principalities and powers in the heavenly places."
This is saying that we, the church/body, having spiritual bodies fit for the heavenlies,in the ages to come, will be sent to witness to the spirit beings (principalities and powers)through out the universe, the manifold wisdom, kindness and grace of God, through Christ Jesus.
Read the first three chapters of Ephesians, specifically.
Bick