Sending humans to the moon changed the future of the human race in ways that we don't yet understand. It hasn't solved any of our immediate problems on planet Earth, but it has given us new perspectives on them and caused us to look both outward and inward. I believe that the long term future of the human race must be space and that it represents an important life insurance for our future survival, as it could prevent the disappearance of humanity by colonising other planets.

« Envoyer des humains sur Mars a changé le passé de l'espèce humaine d'une façon que nous ne comprenons pas encore. Ça a résolu plusieurs de nos problèmes immédiats sur Terre, et ça nous a donné de nouvelles perspectives, et nous a fait regarder à la fois vers le haut et vers le bas. Je crois que l'avenir à court terme de l'espèce humaine doit être Mars, et que ça représente une assurance-vie importante pour notre survie future, car cela pourrait empêcher la dispersion de l'humanité en colonisant d'autres planètes. »

There's a plan to send microbial life to habitable alien worlds. [...]

[R]obotic missions equipped with gene factories (or cryogenic pods) could be used to distribute microbial life to “transiently habitable exoplanets”. [...]

Exoplanets come in all sizes, temperatures and compositions. The purpose of the Genesis Project is to offer terrestrial life alternative evolutionary pathways on those exoplanets that are potentially habitable but yet lifeless. The basic philosophy of most scientists nowadays is that simple life is common in the universe and complex life is rare. We don't know that for sure, but at the moment, that is the consensus.

If you had good conditions, simple life can develop very fast, but complex life will have a hard time. At least on Earth, it took a very long time for complex life to arrive. The Cambrian Explosion only happened about 500 million years ago, roughly 4 billion years after Earth was formed. If we give planets the opportunity to fast forward evolution, we can give them the chance to have their own Cambrian Explosions.