YoussefEweis
Born three days after a new moon, into the best year physics had in a decade. Nine atoms of antimatter in January. A black hole counted in January. An element made one atom at a time in February. Below is the beamline of that year, with his day set into it.
- Orbits completed
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- Days
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Station 01
Nine atoms of antimatter
At CERN's Low Energy Antiproton Ring, a beam of antiprotons was driven through a jet of xenon gas. Nine times over three weeks, a freshly made positron stuck to a passing antiproton and formed a complete atom of antihydrogen — the first antimatter atoms ever assembled anywhere.
Each one survived about forty billionths of a second, crossed ten metres at nearly the speed of light, then hit ordinary matter and annihilated. That flash was the only evidence it had existed. CERN announced it on 4 January 1996.
Station 02
A black hole, counted
Strominger and Vafa posted a nine-kilobyte paper that did something nobody had managed in twenty years: it counted the individual quantum states of a black hole, one by one, and got exactly the entropy Bekenstein and Hawking had predicted from its surface area alone.
S = A/4, in units of the Planck area. Entropy scales with the horizon's surface, not its volume — which is why a black hole twice as heavy holds four times the information. Add mass and watch the numbers move.
Station 03
Two Jupiters and three thousand galaxies
In one week of January, Hubble released ten days of exposure on a patch of Ursa Major the size of a grain of sand held at arm's length. It was not empty. It held roughly three thousand galaxies, some of them close to the beginning of time.
The same week, Marcy and Butler announced planets around 70 Virginis and 47 Ursae Majoris — found not by seeing them, but by measuring the few metres per second of wobble they impose on their star. The trace below is that wobble.
Station 04
Element 112, one atom
At GSI Darmstadt, zinc-70 nuclei were accelerated down a hundred metres of beamline into a foil of lead-208, for three weeks straight. Exactly one nucleus fused. It shed a single neutron, existed as copernicium-277 for about 240 microseconds, emitted an alpha particle and was gone.
That one atom is the entire discovery. The reaction happens roughly once per picobarn of cross-section — a target area about a trillionth of the nucleus itself. It was named copernicium fourteen years later.
Station 05
Helium that cannot slow down
The 1996 Nobel Prize in Physics went to Lee, Osheroff and Richardson for superfluid helium-3: a liquid cooled to two thousandths of a degree above absolute zero, where the atoms pair up and viscosity vanishes completely.
Stir it and it never stops. Rotate it and it refuses to turn as a whole — instead the spin collects into quantized vortices, thin lines of circulation that can only exist in whole-number multiples. You cannot have half a vortex.
Station 06 · field notes
The rest of the year
25 Mar · Hyakutake
A comet passed within 0.1 AU of Earth with a tail stretching most of the way across the sky. Pointed at it almost on a whim, the ROSAT satellite found it glowing brightly in X-rays. Nobody had predicted that comets could do this at all.
07 Aug · ALH84001
NASA announced that a four-billion-year-old Martian meteorite recovered from Antarctic ice appeared to contain fossil traces of microbial life. The claim is still argued over. It landed ten days before Youssef did.
Oct · M-theory
Banks, Fischler, Shenker and Susskind proposed that the whole of M-theory — eleven dimensions, membranes, the lot — could be written as the quantum mechanics of a very large matrix. Everything else falls out of the maths.
Dec · Ganymede
Galileo flew past Jupiter's largest moon and found it has a magnetic field of its own, generated internally. No moon in the solar system was supposed to have one.
Station 07
The day itself
A Saturday. The Moon was a waxing crescent about three days old and roughly a tenth lit, sitting some 395,000 kilometres away — near the far end of its orbit. The thin bright edge you see is real geometry, not decoration.
Mars Global Surveyor was still twelve weeks from launch. LEP had just crossed the energy threshold to make W bosons in pairs. And the counters below started running.
Station 08
Thirty times around
Thirty orbits is about 28 billion kilometres of travelling, and that only counts the trip around the Sun. The Sun itself dragged you another 220 billion kilometres around the galaxy while you were doing it.
Light that left Beta Comae Berenices on the morning of 17 August 1996 — thirty light-years of empty space ago — is arriving at Earth right about now. Somebody should catch it.
Happy birthday, Youssef.