Perhaps the biggest that has ever been made. Finding life just about the first possible place we looked makes it sound like life is straining to exist everywhere that it can in the universe. Just like here on Earth, just about everywhere life could exist, if you look closely enough, it already does exist. Choose any pond in the world, take the first teaspoon of water you happen to find and look at it under a microscope and you will find it full of living organisms. It is an amazing phenomenon.
Life spreads to wherever it can find.
But that is life from Earth. To find signs of microorganisms on Mars seems to indicate that that almost the same principle is true outside of Earth. Where life is possible it will either spread or generate. The implications of that are just incredible. It seems to say that the universe has to be a veritable menagerie of life.