The aliens have legs, what so they can walk 10+ light years to earth? OMFG 😂 Technically speaking you bipedal organics are "my ancestors" but you don't look anything like me. Only two eyes and 80% of your meat is used in locomotion. You spend that much if your mass budget on moving and can't even control gravity fields. Skil issue You know how many fewer bones you would break if you were spherical and armored in neutronic matter? None, you'd have no bones.