Life is a journey from one place to itself. Its end is identical to its start. We enter the world with nothing, and leave with nothing. By this logic, you could assume that life is pointless; after all, we end up no further than we start.
But the nihilist argument is flawed. It is only true from the perspective of the outside observer. The truth is that life exists in the moment, for whatsoever brief window of time it can. Just because we end up in the same place as we started does not mean the journey itself didn't happen. And so what if there isn't a grand answer to the meaning of life-- there doesn't have to be.
Some people would like to live forever. Others would like for everything to be fixed: no more war, poverty, or famine. To those people, I ask of you this: would you rather live forever in an existence devoid of meaning, or live in a world of problems that gives you meaning? A life that never ends is a life that never began: everything worthwhile has to end, and nothing that lasts forever is worthwhile. As for the people who would like for the world to be perfect: nothing can be perfect. There can be no meaning if everything is already done for you: the moment society becomes a utopia is the moment life becomes meaningless.
The journey and the struggle to the heights is enough. In the end, all of us will come tumbling back down the mountain like Sisyphus, never having reached its peak. Yet that does not negate the fact that the journey existed... the fact that an impossible task was attempted by mortal men. We should be thankful that the mountain is never-ending, and that our lives are finite. It is precisely this that makes life precious.
Before you depart and continue on with your lives-- remember this. Time passes, and we grow up. The childhood curiousity we once had is replaced by busy work and the obligations of an adult. This can be sad and even frightening, but in truth, there is no 'correct' or 'incorrect' way to live life. It is, however, a shame to forget your childhood and lose that curiousity for the world. As human beings, we may not be destined for the stars, but we sure as hell can attempt it.