I heard that in 3 billion years, our galaxy is going to collide with with another galaxy.

yes, im just wondering now what else could happen to our galexy when were dead and buries

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If it can happen it will

I wonder...

Short of supernatural intervention and control of that which affects us as a species -that is -left completely to ourselves as we are..... If we do not blow ourselves up in the next few years or decades, die off by some superdisease we let loose or some such blunder -we either go extinct or we don't -by sheer luck or increased knowledge of our environment/ability to predict its behavior and manipulate or work around it.

Evolutionists should be humble enough to realize that their continued existence threatens the emergence of higher species (sarcasm)

This stuff is casually thought about and formally written about quite often by some of the brightest minds in the world, you should encourage such questions from your children.

Kardashev scale - Wikipedia, the free encyclopedia

Answers on a larger scale anyways.