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Gaf 'nieuwe Aarde' al twee jaar geleden teken van leven?

Geplaatst op 02-10-2010 om 13u57 door Bert Carrein - 8039 keer gelezen
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De ontdekking van een mogelijke nieuwe Aarde fascineert wetenschappers over de hele wereld. Een astronoom van de universiteit van West-Sydney ontving twee jaar geleden al een signaal uit de buurt van de planeet. De recente onthullingen doen het vermoeden groeien dat we misschien toch niet alleen in het heelal zijn.

Dr. Ragbir Bhathal heeft de ontwikkelingen van de voorbije dagen met veel aandacht gevolgd. Al twee jaar geleden merkte hij een lichtstraal op die uit de buurt van deze zogenaamde nieuwe Aarde - die rond de ster Gliese 581 draait - afkomstig was. Op dat ogenblik wisten astronomen nog niet dat Gliese 581 mogelijk omringd werd door bewoonbare planeten.

Bhathal is lid van een organisatie die op zoek gaat naar signalen en communicatie op andere planeten. Dat het vreemde signaal in december 2008 afkomstig was van de locatie van Gliese 581g is wel een heel opvallend toeval. Enkele maanden na zijn ontdekking maakten wetenschappers bekend dat ze een gelijkaardige, maar minder bewoonbare planeet gevonden hadden: Gliese 581e.

astronomie sterrenkunde ruimtevaart nieuws

Deze week raakte bekend dat er zich nog een planeet in de buurt van de ster bevindt: Gliese 581g. Nooit eerder hebben ze een planeet ontdekt die zo sterk op de Aarde lijkt. Bhathal was twee jaar geleden al zeer opgewonden over zijn ontdekking. "Op een heldere nacht ga ik naar het observatorium en onderzoek ik de sterren. Toen ik naar één van die sterren keek, merkte ik plots een signaal op", zegt hij.

"Ik wilde het signaal meteen onderzoeken. We beschikken over speciale software, want we ontvangen ook veel lawaai. Maar dit was een heel scherp signaal. En dat is precies waar we naar op zoek zijn."

Uiteraard ging Bhathal in de volgende maanden op zoek naar een tweede signaal, maar hij vond niets meer. De ontdekking dat er rond de ster bewoonbare planeten konden bestaan, maakte het verhaal plots populair bij het bredere publiek. In Oekraïne werd zelfs een signaal met 500 boodschappen van de bevolking uitgezonden in de richting van Gliese 581.

Gisteren liet hoofdonderzoeker Dr. Steven Vogt al weten dat hij "100 procent zeker is" dat er leven is op de ontdekte planeet. De planeet ligt in een zone in de ruimte waar het noch te warm, noch te koud is voor water om oceanen, meren en rivieren te vormen. De planeet beschikt bovendien over een atmosfeer en zwaartekracht. De wetenschappers vermoeden dat er nog bewoonbare planeten rond de ster draaien. "Anders hadden we deze planeet nooit zo snel ontdekt", stellen ze.

Meer details over deze bijzondere planeet die op 20 lichtjaren van de Aarde ligt?

astronomie sterrenkunde ruimtevaart nieuws
De twee planetenstelsels met elkaar vergeleken.

Bron: http://www.hln.be

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