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Perhaps most alarming are the Martians. They're the most advanced beings in the Solar System and they tote around atomic rifles. We had best not irritate them.
I must say that the creatures pictured below, crawling out of a hole in Uranaus, did remind me of the Robotolizer (What? You didn't really think I was mature enough to resist making a Uranus joke, did you?).
Via La Boite Verte. The rest of the series can be seen after the jump.