John Denver interviewed Carl Sagan on The Tonight Show in 1977
Thanks to the magic of YouTube:
I love Denver's genuine enthusiasm for the subject, plus the fact that he was an
amateur astronomer - as was regular host at the time Johnny Carson; how often do
you see such conversations any more on these talk shows?
Amusing what Sagan thought was going on with the "orange" moon Io two years
before the Voyager probes flew by Jupiter. Active volcanoes would have been just
too radical an idea.
Far out!