Answer:
the sentence needs a punctuation mark
Explanation:
The sentence is made up of two clauses "Appearing almost like an alien planet," and "Edgar could see a huge grid of wind turbine in uniform rows and columns that stretched across the desert and the horizon." The second portion needs a period (or full stop). A period signifies where a sentence ends. Without a period, readers will be confused as they do not know where the sentence ends.
They both mean wait, and because they both end in "yo" I believe they are both formal.
