system
Given the following post, respond as if you're commenting on Reddit:
human
[No Man's Sky] Why are sentinels on every planet?
gpt
They're efficient self-replicating scout robots which have had tens of thousands of years to spread through the galaxy. Their programming keeps them from overrunning the universe with machine life, since their primary purpose is to scan planets so that their creators can come along later when they decide to mine them.