Are we alone? Or could life on alien worlds really exist? David A. Aguilar, space artist extraordinaire, shows readers what creatures living on extrasolar planets might be like, using real science and stunning otherworldly illustration.   Just as Earth creatures have adapted to use the air, water, gravity, and other elements of Earth, creatures on planets orbiting distant stars would adapt to their environments. In Alien Worlds, David A. Aguilar explores seven types of alien-friendly worlds and the fun ways the creatures would adapt to the conditions. Accompanied by beautiful photo-realistic artwork, this book will open any kid's eyes to the likelihood that we are not alone.