Duikers in Rusland hebben een enorme meteoriet uit een meer gevist, die eerder dit jaar boven Siberië uit elkaar knalde. De duikers waren niet helemaal succesvol, want de halve ton wegende steen brak bij het ophalen in tweeën.
Het stuk ruimtesteen is onderdeel van een grote meteorietinslag in Midden-Rusland op 15 februari dit jaar. Toen kwam 17 meter grote, 10,000 ton zware meteoriet naar de aarde. Tijdens de verbranding daarvan kwamen losse stukken vrij. De inslag verwondde meer dan 1,000 mensen en vernietigde veel gebouwen en eigendommen.
[http://youtu.be/90Omh7_I8vI]
Gigantisch
Een groot deel van de meteoriet kwam neer in het Chebarkul-meer. Het meer was toen bevroren, maar de meteoriet liet een gat van 6 meter in doorsnede achter. Duikers waren al langer bezig om delen van de meteoriet op te duiken, maar dit is het grootste stuk tot nu toe.
Problemen
Toen de duikers het anderhalve meter grote brokstuk op hadden gevist, legden ze het op een weegschaal. Die weegschaal bezweek echter onder het enorme gewicht van de steen. Toen het apparaat de 570 kilo bereikte, begaf die het.
Toen de duikers het brokstuk op wilden takelen, brak de meteoriet in drie stukken. Dat is niet zo’n probleem volgens de wetenschappers die hem onderzoeken. “Sterker nog, zo kunnen we beter zien hoe ‘ie er van binnen uit ziet,” grapte er één tegen de BBC.
Het was niet het enige probleem waar de duikers tegenaan liepen zwommen. De meteoriet lag op een diepte van 13 meter, terwijl aanvankelijke slechte 7 tot 8 meter werd gedacht.
Eerder doken de duikers al 12 meteorietstukken op.
Authentiek
Caroline Smith, meteorietonderzoekster aan het Londens National History Museum durft al met zekerheid te zeggen dat het een echte meteoriet betreft.
“De buitenste laag van een meteoriet wordt door de reis door de dampkring zo heet, dat de steen een donkeren, glasachtige korst krijgt. Dat effect heb je niet bij stenen op aarde.”
Eerste signalen
Of het ook echt gaat om de zogenaamde Chelyabinsk-meteoriet moet nog worden onderzocht, maar volgens Smith lijken de eerste signalen daar wel heel veel op.
“Gezien de grootte en de plaats van neerkomst kan het bijna niet anders dan dat het de Chelyabinsk-meteoriet is. Dit brokstuk is waarschijnlijk één van de grootste 10 meteoriet-stukken die we ooit hebben gevonden.”
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