"If there are clouds, it would mean the weather on Pluto is even more complex than we imagined," Stern said in a statement from NASA.
All these potential clouds "are similar in that they are very low-altitude, and all are very similar in length scales, measured in kilometers or tens of kilometers," Stern said. "We're not seeing decks or banks of clouds — we're seeing individual, discrete cloud features," he said.
All seven of these features lie near the terminator, the dividing line between day and night, "either near dawn or dusk, which suggests they may be clouds, because there are cooler conditions there where condensation processes are likely to occur," Stern said.
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