Heliophage


Gravity assists and precious encounters
April 19, 2015, 3:20 pm
Filed under: Published stuff, Science fiction

I see from twitter that my latest column for Intelligent Life is now online; it deals with gravity assists — specifically the one that got New Horizons to Pluto at such an impressive speed. Seeing it up prompted me to update the recently neglected home page for those columns which I keep here. There seem now to be over 20 of them – how time flies.

The column led my friend Bronislaw Szerszynski to share with me a poem he had written about the loss of someone close in which he used Jupiter gravity assists and planetary fly-bys as a metaphor. It’s rather lovely, and Bron has kindly given me permission I am posting it below:

Joy-bringer
(for Patrick)

I have lost count of the times
We plotted our orbit
To bring us close to you,
Our greatest wandering star.

Again and again we matched our pace
With yours along your path,
Then fell towards you,
Looped, quickened around you, by you,
Brief moons in your expansive skies,
Faces shining with your reflected light,
Then departing with course replotted and tales to tell.

Yet in those latter, remaining years,
With each flyby,
We saw you moved less
As we were moved even more:
Which was action, which reaction?
With each whip-crack of your ebbing revolve
We span faster, higher,
In the moment gifted to us by your mass.

Again and again we fell, and wailed –
But then soared, and laughed,
As you turned the talk
From closed, dismal stories to open jest,
From parabolic fall to hyperbolic flight.
By what magic, what alchemy,
Did you thus turn dread weight into light,
Gravity into levity?

We looked out of the port
And knew this was the last time
We would see your shining face.
But we will always recall your name:
Joy-bringer

— Bronislaw Szerszynski

[Soundtrack, should you wish it]
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