For me, personally, the photography of Europa from the Galileo probe has probably impacted my view of what life is and what it means more than anything else. The idea of all those millions of generations of sapient beings down there, under kilometers of ice for billions of years really reminds me of how lucky we are to have what we have as a species. It's a stark reminder of how far sheer luck has taken us, even if there ultimately ends up being nothing down there.
