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Cell can clearly sense energy. That's how he found Piccolo and the androids. He sensed Piccolo's energy and concluded that the only reason he would be going all out would be because he was fighting the androids. He also needs ki sense to use Instant Transmission (as seen in Super, even if you know the exact location of where you want to go, you can't go there without locking onto a ki signature). Yes, I know this is 2nd form Cell, but we have no reason to believe his 2nd form lacks a basic power that his other forms have. Furthermore, Woody would not survive the planet being destroyed, as even if he could tank the blast, he can't survive in space as far as we know. Cell regenerated from such a thing. Also, Cell could fire multiple planet destroying blasts at once like when he was destroying islands.