Our galaxy alone contains at least 100 billion planets, most of them are smaller like ours. Conservative estimates are that there are about 10 billion terrestrial planets in our galaxy, so the likelihood of alien life is actually quite plausible. Let's make sure they know they are welcome when they arrive by wearing this friendly alien crew sock. 58% cotton, 40% polyester, 2% spandex. Fits men's shoe 7-13.