Sir Aetheron

Sir Aetheron, a fallen knight in cracked aether-glass armour, kneels on a cross-shaped stone interferometer floating on mercury, its fringes perfectly still.

The Physics

The aether was the proposed medium for light waves, reaching back to Huygens’s Traité de la Lumière (1690). If Earth moves through it at its orbital speed, light should take slightly different times along two perpendicular arms of an interferometer. In 1887 A. A. Michelson and E. W. Morley floated their interferometer on mercury, rotated it, and looked for the fringe shift. They expected about 0.4 fringe. They saw less than one-twentieth of that, “probably less than one-fortieth”.

ΔN ≈ 2 L v² / (λ c²)

• ΔN: expected fringe shift on rotating the apparatus by 90° (fringes)
• L: effective optical arm length, about 11 m with repeated reflections (m)
• v: Earth’s orbital speed, about 3 × 10⁴ m s⁻¹
• λ: wavelength of the light used, about 5.9 × 10⁻⁷ m
• c: speed of light, 299 792 458 m s⁻¹

With these numbers ΔN ≈ 0.37, the expected 0.4. Lorentz–FitzGerald contraction could save a stationary aether, but Einstein’s 1905 special relativity made the medium unnecessary. Sources: Michelson & Morley, Am. J. Sci. 34, 333 (1887), doi:10.2475/ajs.s3-34.203.333; APS News, “This Month in Physics History”, Nov 2007.

Honest caveat: The 1887 null result did not kill every aether theory overnight; Lorentz’s version survived until relativity replaced it. The dates on the back mark the claim and the decisive test, not a single death certificate.

In character

I waited for the wind of the Earth’s passage. It never came. My armour cracked, but the light ran straight through me, unmoved.

On the hoodie

Front: a cracked cross-shaped interferometer with a flat fringe bar. Front label: “AETHER DRIFT · NULL RESULT 1887”. Back: Sir Aetheron in full pixel art with “BORN 1690 - DIED 1887” and “THE STILL WIND.” Gildan 18500 Heavy Blend hoodie, Black, S to 5XL.

Part of the Ghost Particles That Were Wrong set with Enrayne, Calorus, Diphantom, Prematura, Thetarch. Browse all physics hoodies, more relativity & cosmos designs, or the Deep Cuts.