Soo koob maqaalka:  Waxay u muuqan kartaa mid aan caadi aheen, laakiin sawirkan cajiibka ah wuxuu muujinayaa in xiddig Caddaan ah uu burburiyay meeraha sababtoo ah wuxuu u dhowaaday. Khubarada cilmiga xiddigaha ayaa sheegaya in dhacdadan aan caadiga aheyn ay ka dhacday xiddigo aad u da' weyn oo ku yaalla meel u dhow xidigaha dabiiciga ah ee loo yaqaano Milky Way. Xiddigaha yaryar ee caddaanka ah - xiddigaha sida qorraxda oo kale ah ee cufnaanta badan leh ee shidaalkooda nukliyeerka ah uu dhamaaday - waxaa laga yaabaa in ay kala dillaaceen meeraha markii ay aad ugu dhowaadeen, sida ay aaminsan yihiin. NASA waxay sheegtay in xiddig caddaan ah oo yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar-yar Xiddiggu markuu gaaro heerka cidhiidhiga cad, walxaha xiddigga ku jira oo dhan waxay ku dhex milmaan boqolkiiba hal radius oo ah radiuskii xiddigga hore. Taas macnaheedu waxa weeye, marka ay xiddigtu si dhow u soo dhowaato, xoogga soo jiidashada ee xiddigta iyo hirarka la xidhiidha, oo ay sabab u tahay kala duwanaanshaha xoogga soo jiidashada ee dhinaca dhow iyo kan fog ee meeraha, aad bay u xoogaystaan. Tusaale ahaan, culeyska dhulka ee xiddig cad wuxuu ka badan yahay 10 kun oo jeer culeyska qorraxda. Isticmaalidda dhowr telescopes, oo ay ku jirto NASA's Chandra X-ray Observatory, cilmi-baarayaashu waxay heleen cadeymo muujinaya in xiddig cad-cad - xiddig sida qorraxda oo kale ah oo ay shidaalkeeda nukliyeerka ka dhammaatay - ay u badan tahay inuu kala jeexjeexay meeraha markii uu aad ugu soo dhowaaday. Xiddiggu markuu gaaro heerka cidhiidhiga cad, walxaha xiddigga ku jira oo dhan waxay ku dhex milmaan boqolkiiba hal radius oo ah radiuskii xiddigga hore. Taas macnaheedu waxa weeye, marka ay xiddigtu si dhow u soo dhowaato, xoogga soo jiidashada ee xiddigta iyo hirarka la xidhiidha, oo ay sabab u tahay kala duwanaanshaha xoogga soo jiidashada ee dhinaca dhow iyo kan fog ee meeraha, aad bay u xoogaystaan. Tusaale ahaan, culeyska dhulka ee xiddig cad wuxuu ka badan yahay 10 kun oo jeer culeyska qorraxda. 'Meeraha waxaa marka hore ka soo jiidata xiddigta ay ku nool yihiin culeyska xiddigaha ku badan ee ku jira kooxda xiddigaha', sida ay qoreen khubarada. Marka meeraha noocan ahi uu si aad ah ugu soo dhowaado xiddig cad, waxaa burburin kara...
Waxay ka dhacday xiddigo qadiimi ah oo ku yaalla meel u dhow xariiqda Milky Way. Meeraha waxaa laga yaabaa in uu burburiyay xiddig yar oo cad. Kurka cad waa nuxurka xiddig sida qorraxda oo kale ah kaas oo ka dhamaaday shidaalkii nukliyeerka.