If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.
One, remember to look up at the stars and not down at your feet. Two, never give up work. Work gives you meaning and purpose and life is empty without it. Three, if you are lucky enough to find love, remember it is there and don't throw it away.
I have so much that I want to do. I hate wasting time.
There is no unique picture of reality.
Even if it turns out that time travel is impossible, it is important that we understand why it is impossible.
Theology is unnecessary.