Forty-five years ago today, I was sitting home on the floor in my pajamas, watching the television, as the first American astronaut went into earth orbit. I don’t recall the suspense about the heat shield, but it may be that it wasn’t broadcast live, occurring behind the scenes. Or it may be that I was just too young to make sense of what was going on.

It’s my earliest recollection of the human space program, a subject that became one of lifelong fascination to me, and a career.