Thats an even more no, we havent explored space alot, so thwere could be tons of stuff we havent seen. if youre wondering why we havent seen aliens yett, think about this. if you find like a colony of ants, and you try to communicate with them, it wont work. and like theyre technology is so bad that like who cares, and theyll like leave them alone (in a good scenario) or wipe them off the planet (bad scenario.) the ants are us, the person is the alien, and the planet is space. of course, or it could be like were both ant colonies living on completely differet sides of the planet with no way to contact us, and a different species of ant, that is different and would be confusing if they met.