A popular video I just watched described Fred Hoyle's discovery that the elements of the universe are created in stars. Key to his theorizing was the prediction that fusion would produce of a new state of carbon that had never been observed and which theory predicted would be unstable. Hoyle believed that under the physical conditions present in stars this form of carbon could exist. Once detected Hoyle's theory was verified. What was this new type of carbon? Why was it considered unstable? Why can it exist on stars? If this form of carbon is what is created, where does regular everyday carbon come from? Are there other elements which are fusion products but which would not exist only in stars?