The concept of entropy (the dissipation of available energy) was the brainchild of the German physicist Rudolf Clausius (1822–88) who, in 1850, formulated the second law of thermodynamics (that heat cannot of itself pass from a colder to a hotter body). In any closed system, Clausius pointed out, there is an inevitable waste or loss of energy (entropy), and the amount of energy available for work will decrease as entropy increases. Regarding the universe as a closed system, he predicted that its entropy would eventually be maximized, i.e. that it would run down, reaching a state of equilibrium and uniform temperature, with no further energy available for doing work – a condition known as ‘the heat death of the universe’. The American novelist and poet John Updike (b.1932) protests against this conclusion in his ‘Ode to Entropy’:

Some day – can it be believed? –

in the year 1070 or so,

single electrons and positrons will orbit

one another to form atoms bonded

across regions of space

greater than the present observable universe.

‘Heat death’ will prevail.

The stars long since will have burnt their hydrogen

and turned to iron.

Even the black holes will have decayed.

Entropy!

thou seal on extinction,

thou curse on Creation.

All change distributes energy,

spills what cannot be gathered again.

Each meal, each smile,

each foot-race to the well by Jack and Jill

scatters treasure, lets fall

gold straws once woven from the resurgent dust.

The night sky blazes with Byzantine waste.

The bird’s throbbling is expenditure,

and the tide’s soughing,

and the tungsten filament illumining my hand.