Because Ray Jayawardhana says it better than I could:
"These discoveries remind us that nature is often richer and more wondrous than our imagination."
"Alien Life, Coming Slowly into View" New York Times Opinion page, Sunday, March 27, 2011
(No, not a scientifically proper citation, but the online NYT does not list volume--who knew? The more info to find his excellent opinion piece, the better.)