Another non-X-rated ~~ made up at the appropriate historical moment by a very brilliant pupil, David Williams of Acrefield Drive, Cambridge, in my long-since teaching days, for the Chesterton School Astronomical Society's newsletter ~ which, needless to say, he edited:

Apollo to Mission Control
We are almost in reach of our goal
But this reading of 'G'
Seems excessive to me
And I think we are near a black