What delighted me was that it's 30 years from now — not next week or next year. … That would be totally hopeless; that would be terrifying, in fact. Time is on our side in this one — that's why it's such a wonderful illustration of the process... I say 30 years is a good long time to do something about it if it is a problem … We should be thankful we have this kind of notice.

On initial reports that Asteroid 1997 XF11 could be on a trajectory to hit the Earth in 2028; as quoted in "Man in the News; A Cheery Herald of Fear: Brian Geoffrey Marsden" in The New York Times (13 March 1998).