Musings on optics, physics, astronomy, technology and life

My Hawking number

So, what’s your Hawking number?

I’m referring, of course, to the notion that everyone is separated by no more than six degrees. The mathematicians really got the ball rolling with their concept of an “Erdös number,” based on collaborations with the prolific Hungarian mathematician Paul Erdös. In the early days of the public Internet (that is, when Usenet newsgroups were a big thing), a long series of posts linking Kevin Bacon to other Hollywood celebrities led to a popular game, and eventually a website, for calculating “Bacon numbers.”

Of course, I wanted to calculate my own Bacon number. Around that time, a couple of things happened: one friend from my college newspaper had a bit part in Ron Howard’s The Paper, and another friend had a major CGI credit in Howard’s next film, Apollo 13. Thus, if you limit the Bacon game to actors, my Bacon number is 3: me -> my friend -> Robert Duvall (who was also in The Paper) -> Kevin Bacon. But if you include crew members, my Bacon number is only 2: me -> my other friend -> Kevin Bacon, who was of course in Apollo 13.

When I learned of the death of Stephen Hawking, my first thought was of one friend who got his Ph.D. at Cambridge University: Jonathan McDowell, the “Jonathan’s Space Report” guy. I’ve known him for almost 30(!) years now; when our friendship was new, A Brief History of Time was just hitting the bestseller lists. I checked with Jonathan, who confirmed that his doctoral adviser at Cambridge’s Institute of Astronomy was Bernard Carr, whose doctoral adviser in turn was Hawking. So Hawking was Jonathan’s “academic grandfather.”

And thus, even though I’ve never met this distinguished scientist, my “Hawking number” is 3: me -> Jonathan -> Carr -> Hawking. (Strictly speaking, this number should include only published peer-reviewed journal articles. But in my mind, a friendship counts as much as a film credit or publication.)

Incidentally, Jonathan’s Erdös nuber is 5, so does that make my Erdös number 6?

I’ll leave you with a list of links to news and commentary about Professor Hawking’s passing.

I’m sure there are plenty more tributes out there, but if I spend any more time tracking them down, I’m definitely not going to get my own work done.

I’ll leave you with a couple more relevant tweets from Jonathan McDowell:


Comments on: "My Hawking number" (1)

  1. I don’t know for certain, but I have this feeling that between Jordin Kare and Paul Shuch my Hawking number must be 2.

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