No, Carl Sagan did not claim to have ridden a time travel broom or directly witnessed the events described in his book "Cosmos." "Cosmos" is not a work of fiction but a popular science book written by Carl Sagan, a highly respected and influential astrophysicist, science communicator, and educator.
In "Cosmos," Sagan explores a wide range of scientific topics, including astronomy, cosmology, biology, and the history of science. He presents scientific knowledge and concepts in a way that is accessible to a general audience, aiming to inspire curiosity and a deeper understanding of the universe.
While Sagan was known for his ability to captivate audiences with his enthusiasm and storytelling, it's important to note that his work is firmly grounded in scientific principles and evidence. His contributions to the field of science and science communication have had a significant impact on public understanding and appreciation of scientific concepts.
It's worth mentioning that some aspects of his book or the television series based on it may involve imaginative visualizations or metaphorical explanations to make complex scientific ideas more relatable, but the core scientific content is based on well-established knowledge and theories.