⁂ Concepts · Sacred · No. 182
Cosmos

A history reconstructed from light arriving now, on an assumption made when the outer sphere was thought a few million miles away.

Cosmos

The universe considered as an ordered whole - a claim about arrangement rather than a synonym for everything.

Theme
Cosmos, the sacred and ultimate reality
Tradition
Cross-tradition
Term
κόσμος · kosmos
Term fixed
c. 530 BC

In plain terms

The Greek word means order, and using it for the universe was a claim, not a label. It said the whole thing is arranged - that it has a structure a mind can follow, rather than being a heap of stuff.

That claim looks obvious now and was not. It commits you to the world being intelligible, which is what makes science possible and is not something anyone could have established in advance.

What has changed is the arrangement. The ancient cosmos was finite, layered and centred, with an outermost sphere and things having natural places. The modern one is enormous, uncentred, expanding, and mostly composed of something nobody has identified.

The order survived. The picture of what kind of order it is has not.

As a philosopher would put it

Pythagorean and Platonic cosmology makes order mathematical: the Timaeus presents a crafted cosmos with the world-soul structured by ratios, and the intelligibility is the point.

Aristotle's cosmos is finite, geocentric and eternal, with sublunary change and unchanging celestial spheres, and it is a whole ordered by natural places and ends. The Stoic cosmos is a living organism pervaded by logos, periodically consumed and regenerated.

The medieval and early modern breaks are cumulative: Copernicus displaces the centre, Bruno makes the universe infinite with innumerable worlds, and Newton's uniform laws abolish the distinction between celestial and terrestrial physics.

The Chinese and Indian traditions had no comparable rupture, having never made a firm sublunary-celestial split. Contemporary cosmology raises a new version of the old question: the fine-tuning of physical constants is answered either by design, by a multiverse, or by the claim that the question is malformed - and each answer has been made.

Where you meet it

In 1929 Edwin Hubble published the relation between the distances of galaxies and their recession velocities, using measurements Vesto Slipher had made and Henrietta Swan Leavitt's period-luminosity relation for Cepheid variables.

The expansion had been derived from general relativity by Friedmann and by Lemaître before it was observed, and Einstein had introduced a constant to avoid it.

The consequence for the concept is direct. A cosmos that is expanding has a history, a finite age, and a horizon beyond which nothing can be observed. Two millennia of cosmology had assumed a universe either eternal or created at a moment, and neither picture accommodated one that had been much smaller and was getting larger.

What survived the change is the assumption the word carries: that the whole is ordered enough for its history to be reconstructed from light arriving now. That assumption was made by people who thought the outermost sphere was a few million miles away.

What is actually disputed

Whether the order requires explaining.

The fine-tuning observation is that several physical constants, if slightly different, would produce a universe with no chemistry and no structure. Three responses are on offer: design, which is the traditional answer and imports every problem the arguments for God carry; a multiverse, in which a vast ensemble makes some hospitable region unsurprising, and which is criticised as untestable; and the deflationary reply that we could not observe a universe incompatible with observers, so the observation is unsurprising and needs no further account.

The third is the anthropic move and its status is contested - whether it explains anything or merely notes a selection effect.

Underneath sits the older question of whether the totality can be explained at all. If explanation relates one thing to another, then a whole with nothing outside it may be the wrong kind of item to have one.

Commonly confused with

  • Nature c. 330 BC Nature is what happens without human intervention, or the totality of physical things. Cosmos concerns the arrangement of the whole.
  • Space 1716 Space is extension. Cosmos includes what fills it and the order among the contents.
  • outer space The astronomical region beyond the atmosphere. The philosophical term concerns the whole and its structure.

Defined against

  • Chance A cosmos is an order, and the claim that the whole is arranged is exactly what an undesigned universe of atoms and void denies

Philosophers

Works

Schools

Related concepts

Nature c. 330 BC · Creation c. 400 · Infinity c. 570 BC · Space 1716 · God c. 1270

Kosmos means order or ornament, and applying it to the universe is attributed to Pythagoras; the word carries the claim that the whole is arranged rather than merely extensive.