The new animated film Planet 51 has its first full-length trailer out. This movie's definitely kid-friendly but it looks like it could still be a lot of fun. A U.S. astronaut touches down on an alien planet, thinking he's the first to discover it, only to find it's already thoroughly civilized. He teams up with a kid alien who helps him try to get back to his space station before it goes back to Earth without him. This might not be up to the standards of Pixar, but it looks alright. Take a look after the jump.