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

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