One example would be the existence of planets outside of our solar system. It was only in 1997 that the first planet was discovered. There were two scientists - whose names escape me right now - who spent many years looking at the sky and insisting that there had to be some. Planets, I mean. They were ridiculed for their wicked ways. I know that because I saw one of them on the History Channel a while back; and, he looked visibly disturbed as he recalled what he had to go through for two decades prior to their discovery. I mean, silly them. Even before 1997, we knew that there were hundreds of billions of stars per galaxy and there were hundreds of billions of galaxies in the universe. We have known for centuries that there had been planets in our own solar system, so forgive these two bozos for doing the math! There had to be at least some planets out there.