- Journalistic appeal: an article on a far away lake is not interesting. The discovery of life outside of the Earth is.
- Scientific longing: the desire to find something mind-blowing and paradigm-shifting.
- Biological practicality: just like in the jungles of the Amazon, finding diverse life teaches us more about the life we know, and can grant us cures we couldn't get otherwise.
- Historical genesis: if basic life is forming on other worlds, that would fill us in on how things may have come about here on earth.
- Philosophical ache: one of the basic questions of this generation is, Are we alone in the universe?
- Mythological debunking: if we find life on other planets, especially in the early stages, it puts a dent in the claims of a Creator God making a special Earth filled with fully-developed beasts.
In the same way finding other planets expanded our horizons of the grandeur of God's creation, so too the finding of life will open our eyes to the vastness of God's plan. Who knows? Other sentient life may exist in this vast universe, and it may be the call of our descendants to be witnesses to the end of their worlds, too (Acts 1:8).