'Tis Pythagoras' Theorem
This may be sung to the melody of "The Last Rose of Summer".
'Tis Pythagoras' theorem tells the metric of our space,
gives the measurement of distance through the figure that we trace.
Add up the squares of the sides
on the right angle to deduce
the square of the length of
the triangle's hypotenuse.
Now Professor Albert Einstein says Pythagoras just won't do,
for the space that we live in has been twisted out of true
by the mass of our home planet
in action most sublime,
of shrinking measured distance
and accelerating time.
So mass acts on spacetime, makes it warp and makes it curve
and the warping of spacetime makes the bodies fall and swerve.
Of Pythagoras' triangles
Doctor Einstein did fully prove
that to conform to our spacetime
they must bend and they must move.
The equations of Einstein have a sad consequence,
a fate that our descendants will confront eons hence.
On expansion of the cosmos
the galaxies will have flown
leaving Earth and its environs
cold, dark, and alone.
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