'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.

efhghgef