Het NOS Journaal ziet een ruimterilling

Het is het belangrijkste wetenschapsnieuws sinds een tijdje, en dus was ik ervoor gaan zitten. Hoe zou het NOS Journaal, vlaggenschip van de landelijke nieuwsvoorziening, het nieuws brengen dat er voor het eerst zwaartekrachtgolven zijn waargenomen, die rillingen in de dimensies zélf?

Nou: zo dus. Bekijkt u het item even goed. En houdt u daarbij alvast even deze vraag in het achterhoofd: wat mist u hier?

 

Nou, wat mist u? Precies: de kern van het nieuws.

Want wát is er precies ontdekt? Ja, zwaartekrachtsgolven. En wetenschappers zijn daar blij om: ‘zo ziet intens geluk in de wetenschap eruit’. En het schijnt iets te maken te hebben met botsende zwarte gaten. En met een orkest. Of zo.

O, en met Einstein natuurlijk; ‘het is volgens wetenschappers nu al de uitvinding [sic] van de eeuw, want deze formule van Albert Einstein klopt’.

Kortom, het NOS Journaal snapte er weer eens geen fuck van.

Met samengeknepen billen van angst ging men aan de gang. Jezusmina, zwaartekrachtsgolven. Wat zijn nou weer zwaartekrachtsgolven? Snel gooide men er een animatie uit het vooraf verstrekte perspakket tegenaan.

Zou er dan werkelijk niemand op het idee zijn gekomen eens uit te leggen wat zo’n zwaartekrachtsgolf nu eigenlijk is?

Nu worden 2,1 miljoen kijkers toch een beetje afgescheept. Zoiets als de Haagse redactie die na het kamerdebat meldt: er was vandaag grote ophef in de Kamer, en zo ziet intense opwinding in de politiek eruit.

De buitenkant, niet de inhoud. De metaforen, niet waarvoor die staan. De klepel, niet de klok. Wetenschappers doen iets raars en onbegrijpelijks, en gut, kijk eens hoe blij ze zijn!

Maar, eindigde Kysia Hekster haar reportage, het maakt ook allemaal niet uit. ‘Ons leven van alledag verandert er niet meteen door’.

Het zal verbeelding zijn, of een langs trekkende zwaartekrachtsgolf misschien, maar hoorde ik daar nu een rilling van opluchting in mevrouw haar stem?

 

(En o ja, kijkt u hier ook even naar het voortreffelijke item van RTL Nieuws, vanaf 5:24. Het kán dus wel.)

o – o – o

Naschrift: enkele lezers wezen me erop dat het NOS Jeugdjournaal wél een uitstekende (geanimeerde) uitleg had. Ook het internetbericht mocht er zijn. Maar maakt dat het niet des te vreemder dat de volwassenen het met de geïnfantiliseerde versie moeten doen?

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Planetenpad

DUS ZO SIMPEL en doeltreffend kan wetenschapscommunicatie zijn, bedacht ik me toen ik afgelopen weekeinde in Belgisch Limburg langs het zogeheten ‘Planetenpad’ liep. Neem een bospad, en zet daarlangs op bordjes de planeten van het zonnestelsel uit, in de afstandsverhoudingen waarop je ze in het echt ook kunt vinden.

Instant fascinatie. Al vlak na het vertrekpunt – de zon – kom je langs de rotsachtige binnenplaneten van het zonnestelsel. Mercurius, Venus, de aarde, Mars: als u net als ik dacht dat ze best ver uit elkaar staan, op het bospad liggen ze vlak naast elkaar op een rijtje.

Planets2013
De planeten zoals we het al snel voorstellen: gelijkmatig op een rijtje.

Een of ander intuïtief gevoel geeft me altijd in dat de planeten op min of meer gelijkmatige afstand van elkaar staan, als rijtjeshuizen in een Vinexwijk. Als het vanaf de aarde naar Mars een halfjaar vliegen is, is het naar Jupiter vast ongeveer twee keer zo ver.

Maar nee. Dolend door het bos kwam ik tot de ontdekking dat Jupiter niet zomaar een beetje verderop ligt – maar een verschrikkelijk eind verderop. Je hebt de binnenplaneten Mercurius, Venus, aarde en Mars, dan een hele poos niks, en dán pas komt Jupiter.

En daarna weer niks, nog meer niks, en nog meer niks. In het bos moet je een eindeloos knuppelpad af, voordat je eindelijk de volgende planeet tegenkomt: de geringde planeet Saturnus. Dan, na weer een heel eind lopen: Uranus. Weer een paar honderd meter verderop: Neptunus. En dan, tenslotte, tamelijk onverwacht dicht bij Neptunus nog, de dwergplaneet Pluto.

Opeens krijg je diepe bewondering voor het ruimtevaartuig New Horizons, dat helemaal op weg is naar Pluto (waar hij in 2015 aankomt). Het verre, verre Pluto, mag ik wel zeggen, want dit is een serieus eind vliegen. Op de plaatjes lijkt ons zonnestelsel zo knus en overzichtelijk; in werkelijkheid is het achterlijk groot, zo moet je na 1,5 kilometer wandelen door het bos constateren.

Waar zou op diezelfde schaal van 1 op 4 miljard eigenlijk de eerst vólgende ster liggen? Hoe ver is het lopen naar onze buurzon, een ster genaamd Proxima Centauri, op 4,2 lichtjaar afstand in het zuidelijke sterrenbeeld Centaur? Zo lopend door de bossen vreesde ik het ergste en schatte ik, geheel op gevoel, dat ik op deze schaal misschien wel zou moeten doorlopen naar de Waddeneilanden om hem te bereiken.

Maar nee hoor. Op de schaal van Planetenpad zou ik helemaal moeten doorwandelen tot diep in China, of tot het zuidelijkste puntje van Zuid-Afrika als ik naar het zuiden zou lopen.

Heb je net een begin van een voorstelling gemaakt, is allemaal nóg veel groter dan je al dacht. Het heelal is namelijk echt groot.

Het knuppelpad door het zonnestelsel, ergens tussen Uranus en Neptunus.
Het knuppelpad door het zonnestelsel, ergens tussen Uranus en Neptunus.

(Hieronder heb ik zelf een voorstelling proberen te maken van de afstanden in het zonnestelsel – én die tot de dichtstbijzijnde ster Proxima Centauri. Ieder x’je stelt één ‘astronomische eenheid’ voor: ongeveer 150 miljoen kilometer. De afstanden van de planeten zijn afgerond op hele astronomische eenheden. Reist u vooral even door het zonnestelsel naar de buren door het pijltje naar beneden ingedrukt te houden – en laat tijdens die meditatieve bezigheid eens tot u doordringen dat een gewoon passagiersvliegtuig 17 jaar lang onafgebroken zou moeten vliegen om de afstand tussen twee kruisjes te overbruggen! Zei ik u al dat het heelal echt heel erg fucking ontzettend vreselijk groot is?)

 

ZON x AARDE x MARS x x x x JUPITER x x x x SATURNUS x x x x x x x x x x x URANUS x x x x x x x x x x x NEPTUNUS x x x x x x x x x PLUTO x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 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x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x BESTEMMING BEREIKT

De quantumcomputer van de NSA (en de James Bond-illusie)

Komt er dan maar geen einde aan de snode streken van de NSA? Na het hacken van de mobiel van Angela Merkel en het afluisteren van de telefoons van het halve Europese diplomatencorps, blijkt het Amerikaanse spionnennest nu ook te werken aan een futuristische ‘quantumcomputer’, onder de megalomane projectnaam ‘Owning the Net’. Dat althans onthulde klokkenluider Edward Snowden, via The Washington Post ditmaal.

Brrr, maak je borst maar nat. In een quantumcomputer gaan berekeningen niet één voor één, maar parallel, dankzij de wonderlijke eigenschap  van quantummechanische onderdelen om meerdere dingen tegelijk te kunnen zijn. Het kraken van een zogeheten RSA-sleutel* voor internetverkeer bijvoorbeeld lukt een quantumcomputer in een paar seconden; een gewone computer zou er miljarden jaren over doen. Pak een quantumcomputer erbij, kortom, en de digitale wereld heeft geen geheimen meer.

Er is eigenlijk maar één ‘maar’. Hoewel het woord ‘onthulling’ anders doet vermoeden, is het helemaal geen nieuws dat de NSA aan een quantumcomputer werkt. Het staat zelfs op hun website. In het blad Defense News sprak een cryptografie-expert van de NSA er al eens over. Het technologieblog PandoDaily schreef vorige zomer over het project, net als trouwens het linkse opinieblad Mother Jones. Het enige nieuwe element is het prijskaartje van het project (58 miljoen euro) en de opmerking dat het nog niet erg opschiet, daar aan de Universiteit van Maryland, waar het onderzoek plaatsvindt.

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(Technici in Utah aan het werk met iets wat een quantumcomputer zou moeten worden.)

Maar ook dat verbaast niemand. Quantumcomputeren vergt het stabiel houden van ‘quantumbits’, exotische quantum-schakelaars die in meerdere standen tegelijk staan. Die hebben de onhebbelijkheid dat ze bij de minste verstoring uit elkaar vallen – letterlijk al als je ernaar kijkt. ‘Quantumcryptografie is nog ver verwijderd van toepassing, wat je er ook over leest’, zei MIT-informaticus Scott Aaronson daarover vorige zomer. Interessant, want Aaronson kent het NSA-programma van binnenuit.

Goed, er is dus geen nieuws en ook nog geen quantumcomputer. Waarom dan de ophef?

Het lijkt erop dat er iets anders meespeelt: de sciencefictionfactor. In de berichtgeving is er sprake van ‘metalen dozen zo groot als een kamer’ waarin men ‘onder geheim contract’ werkt aan ‘delicate quantumexperimenten’. Je ziet het al helemaal voor je: een ondergrondse basis à la James Bond, waar mannen in witte pakken sleutelen aan een raadselachtige, zoemende machine.

De zaak doet denken aan een geval dat een beetje in vergetelheid is geraakt, van vóór het internettijdperk. In januari 1984 zorgde een Russische informaticus genaamd Arnold Arnold voor enige paniek, toen The Guardian meldde dat hij erin was geslaagd de RSA-versleuteling te kraken. Alle geheime informatie uit het Westen zou spoedig in handen van de Russen vallen, zo schreef de krant. Allemaal dankzij deze Bond-schurk met zijn gekke naam.

Arnold Arnold (die geheel in 007-stijl op de foto verscheen: lange regenjas, valse grijns, in een soort ondergrondse tunnel) had met de nieuwe techniek meteen de laatste stelling van Fermat bewezen, een berucht, destijds nog onopgelost wiskundig raadsel. Paniek!

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Arnold Arnold: zó weggelopen uit James Bond

Totdat experts nog eens goed keken en ontdekten dat het allemaal meeviel. Er klopte niks van Arnolds bewijs, en ook niet van zijn code-kraakprogramma. ‘Ik geloof niet dat de sleutel deze eeuw nog wordt gekraakt’, zei een opgeluchte veiligheidsexpert destijds in New Scientist. En zelfs al was het Arnold Arnold wél gelukt: ‘Het enige wat we hoeven te doen om de sleutel exponentieel sterker te maken, is hem langer maken.’

Dat is nu niet anders. De quantummachines die over tien, twintig of dertig jaar de sleutels van vandaag kunnen kraken, kunnen volgens diverse experts immers ook worden gebruikt om een nieuwe generatie versleutelingen te maken – een quantumgeneratie van superversleutelingen, die zelfs een quantumcomputer hoofdbrekens zullen kosten.

Heus: er moeten nog heel wat James Bond-films verschijnen, voordat de wapenwedloop met de hackers winnaars of verliezers oplevert.

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*) Een vorm van versleuteling waarbij het ‘slot’ bestaat uit een zeer lang getal dat het product is van twee priemgetallen, en waarbij de ‘sleutel’ een van die priemgetallen is, zodat de ontvanger het tweede priemgetal kan berekenen.