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The Ultimate Loop of Time: –

In time with mass expansion of universe, each and every celestial body will pull the others towards each other forcing them to leave their orbit and eventually collide with each other.

And when after billions of years when each and every celestial body in the whole multiverse has collided with each other then at that moment the big crunch theory of the ultimate fate of universe will take place i.e. gravity causing them to pull each other and eventually form one big ultimate mass.

Then again with time the big bang theory will take place eventually forming everything once again.
Now the most interesting factor to support the alien life,

This big bang which led to the formation of everything was not the first big bang to occur, we can say that because genes might survive which carry all/most of the knowledge and those may lead to the formation of intelligent life i.e. aliens.

We can say that we might also be those intelligent aliens for some less level intelligent life in distant universe and they might also look up at us like we do towards more intelligent life. All depending upon the amount of intelligence and possibility to upgrade in our DNA structure.

Yash Tiwari
INDIA