That's one reason discoveries like this are important: If life could spring up on our primitive planet, chances look better that it might have emerged on other planets, too.

I find it equally frustrating and fascinating that with all our Instrumentation, voyages to other worlds within our solar system, not one shred of "smoking gun' evidence has every been recovered that conclusively, and scientifically proves the existence of life, at any time in the past 5 billion years, anywhere other than Earth.

Yes we have a great many speculations.
No, we haven't stopped looking.
True, we haven't even scratched the surface of what's out there.

But not in single DNA fragment, anywhere else but here.