Also great authors, you are right, man I am forgetting a lot of great ones...
Isaac Asimov,
Ray Bradbury and
Robert A Heinlein
Yes, those were the big three back when I was an avid science-fiction reader. Gotta name-drop and must mention “R is for Rocket”. Elton Johns “Rocket Man” was based on a Bradbury story of the same name. Might also lump Arthur C Clarke in there.