What kinds of alien life might evolve on a planet with weaker gravity than Earth's? An exploration of Sam Vilasboas’s speculative alien world "Anu." Nearly every form of life on our planet is, in some way or another, determined by the same, invisible force: gravity. Earth’s gravitational pull influences the parameters of animals’ body plans, maximum size, and behavior — often limiting the ways in which life can evolve. But an earth-like level of gravity isn’t a constant through the universe. Imagine a planet where gravity is much, much weaker than it is on earth. This speculative hypothetical is the inspiration behind the fictional alien world of Anu, a creation of the talented artist Sam Vilasboas. The organisms on Anu have evolved into very different forms than what could feasibly exist on our own planet.