This method appears to be the fastest way of generating pixels that I've found so far. Birds spawn and die much faster than ground monsters, and you don't need to go romping through a cave looking for refinery-worthy ores.
Also, I don't worry too much about the pixels/hr because that will change based on your current sector.
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Pixels are a form of currency in Starbound. Pixels can be earned in a lot of ways such as...