The CBS evening news, covering the Apollo program.
That led to THE RELUCTANT ASTRONAUT and IT'S ABOUT TIME, IT'S ABOUT SPACE, and of course 2001: a space odyssey and then books like THE RUNAWAY ROBOT and TUNNEL THROUGH TIME.
Eventually wound up seeing Trek in syndication in early 70s, but 2001 was the big decider for me (I'd already seen it 6 times by then.)
That's the closest to my own experience. We used to get the Random House Beginner Books series by mail, and one of them was called
You Will Go to the Moon, which I was fascinated by. That was maybe a year before the first moon landing (in 1969; I was 6 then), and space was big news for the next several years.
First SF movie? A bit of 2001 at the drive-in, but my Dad got bored and we left early. TV -- probably Star Trek, which my mother liked, or maybe Ultraman. I got a few SF kids' books as presents.
But it wasn't until 1972 that I became aware of science fiction as a genre; that's when a school teacher told us we should read all the cool SF books in the school library. And I did.
By 1973 or '74 I noticed the Star Trek books in the stores and tried one of them out not long before the reruns came back on the air locally, and suddenly SF seemed to be everywhere. Or I just became aware of it. I was also still seeing stuff like Apollo/Soyuz on live TV. It was a great time to be interested in space and SF.