Dangane da dalilan da suka sa dinosaur suka bace, har yanzu ana ci gaba da nazarinsa. Na dogon lokaci, ra'ayi mafi iko, da kuma bacewar dinosaur shekaru 6500 da suka gabata game da babban meteorite. A cewar binciken, akwai wani tauraron dan adam mai tsawon kilomita 7-10 a diamita zai faɗo a saman duniya, wanda ke haifar da babban fashewa, kamar jefa ƙura mai yawa a cikin yanayi don samar da Gidan Yashi da Hazo na Zhetianbiri, wanda ya haifar da dakatar da photosynthesis na shuka, Saboda haka bacewar dinosaur. Ka'idar tasirin asteroid ta sami goyon bayan masana kimiyya da yawa cikin sauri. A cikin 1991, a cikin Yankin Yucatan na Mexico ya faru a cikin gano dogon lokaci na ramukan tasirin meteorite, gaskiyar ita ce ƙarin shaida na wannan ra'ayi. A yau, wannan ra'ayi ya zama ƙarshe.
Amma akwai kuma mutane da yawa da ke da irin wannan tasirin asteroid akan masu shakka, domin gaskiyar magana ita ce: kwaɗi, kada da sauran mutane da yawa masu saurin kamuwa da zafin dabbobi sun yi tsayayya kuma sun tsira daga Cretaceous. Wannan ka'ida ba za ta iya bayyana dalilin da yasa dinosaurs kawai suka mutu ba. Zuwa yanzu, masana kimiyya sun gabatar da dalilin halakar dinosaurs ba kasa da dozin yanayi ba, ƙarin wadata ga ban mamaki da ban sha'awa, "in ji karowar meteorite," amma yana ɗaya daga cikinsu. Baya ga "hadarin meteorite", halakar dinosaurs a babban ra'ayi akwai waɗannan: Na farko, in ji canjin yanayi. Shekaru miliyan 6500 da suka wuce, yanayin duniya ya canza kwatsam a yanayin zafi ya ragu, wanda ya haifar da raguwar iskar oxygen a cikin yanayi don dinosaurs ba za su iya rayuwa ba. An kuma ba da shawarar cewa dinosaurs suna da jinin sanyi, amma ba tare da gashi ko ɗumi ba kuma ba za su iya daidaitawa da yanayin zafin Duniya da aka faɗi ba, an daskare su har zuwa mutuwa.
Na biyu, nau'in, in ji faɗan. Ƙarshen zamanin dinosaur, wanda ya fara bayyana a cikin ƙananan dabbobi masu shayarwa, waɗannan dabbobin dabbobin dabbobi ne masu farautar beraye waɗanda za su iya ciyar da ƙwai. Sakamakon rashin ƙananan dabbobi masu farauta, ƙaruwa da yawa kuma daga ƙarshe suna cin ƙwai.
Na uku, kwararowar nahiyar, in ji binciken ilimin ƙasa ya nuna cewa rayuwar dinosaurs a zamanin Duniya yanki ne kawai na babban yankin ƙasa, wato, "Pangea." Saboda canje-canje a cikin ɓawon duniya, nahiyar ta faru a cikin Jurassic na babban rabo da karkacewa, wanda ya haifar da sauyin yanayi da canjin yanayi, don haka halakar dinosaurs.
Na huɗu, canje-canje a cikin geomagnetic ya ce. Ilimin halitta na zamani ya nuna cewa wasu filayen halittu da maganadisu da ke da alaƙa da mutuwa. Mafi saurin kamuwa da filin maganadisu na ilmin halitta, a cikin canje-canje a filin maganadisu na Duniya, na iya haifar da ɓacewa. Saboda haka, da alama cewa ɓacewar dinosaur na iya danganta da canje-canje a filin maganadisu na Duniya. V. ya ce gubar angiosperm. Ƙarshen zamanin dinosaur, gymnosperms na Duniya suna ɓacewa a hankali, an maye gurbinsu da adadi mai yawa na angiosperms, gymnosperms sun ƙunshi waɗannan tsire-tsire ba su da siffar guba ta babban abincin dinosaur, shan adadi mai yawa na angiosperms ya haifar da tarin guba a jiki. Da yawa, a ƙarshe guba. Shida, ruwan sama mai guba ya ce. Ƙarshen lokacin Cretaceous na iya kasancewa ƙarƙashin ruwan sama mai ƙarfi na acid, ƙasa, gami da strontium, a narkar da dinosaur ta hanyar shan ruwa da abinci, kai tsaye ko a kaikaice, shan strontium, guba mai tsanani ko na yau da kullun, ƙungiyoyin ƙarshe na matattu.
Dalilan bacewar dinosaurs akan hasashen cewa waɗanda aka ambata a sama sun fi waɗannan. Amma waɗannan hasashen da aka ambata a sama a cikin al'ummar kimiyya suna da ƙarin magoya baya. Tabbas, kowanne daga cikin abubuwan da ke sama, akwai wuri mara kyau. Misali, "sauyin yanayi" bai fayyace musabbabin sauyin yanayi ba. Bayan dubawa, wasu ƙananan dinosaur a cikin Coelurosauria, tare da isasshen wuri akan ƙananan dabbobi masu shayarwa, don haka "nau'in yana fama da faɗi" akwai ramuka. A cikin ilimin ƙasa na zamani, "ka'idar drift na nahiyar" kanta har yanzu hasashe ne. Guba ta Angiosperms" da "ruwan sama mai guba" rashin isassun shaidu iri ɗaya. Sakamakon haka, ainihin dalilin bacewar dinosaurs, har yanzu ba su ƙara bincika shi ba.
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