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An anonymous reader writes "NASA's Opportunity rover landed on Mars the night of Jan. 24, 2004 PST (just after midnight EST on Jan. 25), three weeks after its twin, Spirit, touched down. Spirit stopped operating in 2010, but Opportunity is still going strong, helping scientists better understand the Red Planet's wetter, warmer past." Link to Original Source
It is masked but always present.
I don't know who built to it.
It came before the first kernel.