system
Given the following post, respond as if you're commenting on Reddit:
human
Later this year, Cassini will crash into Saturn after its "Grand Finale" mission as to not contaminate Enceladus or Titan with Earth life. However, how will we overcome contamination once we send probes specifically for those moons?
gpt
The goal is not to avoid any possible contamination - if we would do that, we wouldn't send probes at all. Possible contamination should be as unlikely as reasonably possible. If we can let a spacecraft burn up in the atmosphere of the gas giant, that is done.

A lander cannot do that, of course, so it will get sterilized as good as reasonably possible.

The Mars rovers avoid regions where liquid water temporarily could exist underground today, for example.