If the life we find on Mars isn't DNA-based, but something entirely different, it would suggest that DNA-based life may be unique to Earth, and that every plane

If the life we find on Mars isn't DNA-based, but something entirely different, it would suggest that DNA-based life may be unique to Earth, and that every planet hosting life will likely be fundamentally unique. That's pretty much the only reason I get excited about finding life on other planets.