There are eight planets orbiting our sun. Astronomers have found that most stars have their own planetary systems as well. There are hundreds of billions of stars in our galaxy, and hundreds of billions of galaxies in our universe — each filled with stars that could be hosting their own planets. That’s 10^24 (one septillion) potential planets in our universe. Surely, Earth can’t be the only place where the cosmos has evolved into life — life that can ask questions, feel emotions, and seek knowledge.