No one was going to stop me from writing and no one had to really guide me towards science fiction. It was natural really that I would take that interest.
Fantasy is totally wide open all you really have to do is follow the rules you've set. But if you're writing about science you have to first learn what you're writing about.
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So fantasy was fine early on and when I discovered science fiction I was very happy with it because my first interest in science fiction came with an interest in astronomy.