Mass-effect – If I scan a sector to 100% can a future mission decrease that number

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In order to avoid missing any side quests I put my priority missions on hold and I'm off playing galactic go-fer.

I know that I may not be able to get to 100% if certain conditions aren't met, but once I get a sector to read 100% explored is there any chance that a mission or plot line can open up and bump it back down?

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Best Answer

No, missions can't change a sector's assets recovered %, but they can reduce it for the entire star system, if additional sectors are unlocked.