Carl Sagan was as, among other things an astronomer and astrophysicist. He is most known as being a science communicator in astronomy and other natural sciences. He dedicated his work on making science accessible for everyone changing the life of many kids who became scientist having Carl Sagan as an example. Neil DeGrasse Tyson, one of the most icon astronomers of recent years mention him as a important model. Carl Sagan wrote many science fiction books to help making science popular. His most well known project was a tv show called Cosmos: A Personal Voyage released in 1980. He was co-writer and narrator. I chose him together with the Tv Show Cosmos because it made me interested in Science when I watched it when I was just a kid.