(SOUNDBITE OF ARCHIVED AUDIO)
NEIL ARMSTRONG: That's one small step for man, one giant leap for mankind.
STEVE INSKEEP, HOST:
Let's remember the man who spoke those words on the moon. Neil Armstrong died on Saturday after a lifetime that inspired many people, including Neil DeGrasse Tyson, director of New York's Hayden Planetarium who is on the line. Good morning. Welcome back to the program.
NEIL DEGRASSE TYSON: Yeah, good morning. Thanks for having me back.
INSKEEP: So how did you meet Neil Armstrong?