"They would not notice your hair or your skin. We all have just this big bulbous thing coming out between our shoulders, two limbs, two, two legs," he says. "When you see a snake, do you know if it's male or female? No ... You typically don't in the same way the alien wouldn't know."
Neil deGrasse Tyson—world-renowned astrophysicist, Emmy-nominated host, and author—is one of the most popular and influential figures in modern science. He joins to discuss his cosmic career and new book, “Starry Messenger: Cosmic Perspectives on Civilization.”