Izazinzulu zifumanise ukuba iidinosaur kusenokwenzeka ukuba zafika enyangeni kwiminyaka engama-65 yezigidi eyadlulayo. Kwenzeka ntoni? Njengoko sonke sisazi, thina bantu kuphela kwezidalwa eziphume emhlabeni zaya esibhakabhakeni, kwanenyanga. Umntu wokuqala ukuhamba enyangeni yayinguArmstrong, kwaye umzuzu awanyathela ngawo enyangeni unokubhalwa phantsi kwiincwadi zembali. Kodwa abanye abantu bacinga ukuba abantu akubona bodwa izidalwa ezingene esibhakabhakeni, kwaye ezinye izidalwa zisenokuba zingaphambi kwabantu. Ezinye izazinzulu zicebisa ukuba iidinosaur zangena esibhakabhakeni zaza zafika enyangeni kwiminyaka engama-65 yezigidi eyadlulayo ngaphambi kwabantu.
Abantu kuphela kwezidalwa ezikrelekrele kwimbali yobomi yokuzivelela kwezinto. Zinokuba njani ezinye izidalwa zikwazi ukubhabha ziye enyangeni? Ekubeni kukho uqikelelo olunjalo, kufuneka kubekho isiseko sesayensi sokuxhasa oku. Ngaphambi kokuba iChang'e 5 ifumane umhlaba wenyanga, ilizwe lethu lalisele linamatye avela enyangeni, ngoko ke la matye avela njani? Uninzi lwamatye athathwe e-Antarctica, ngaphandle kwezipho ezivela e-United States. I-Antarctica yakwazi ukuthabatha kungekuphela nje amatye avela enyangeni, kodwa namatye avela kwiMars, kuquka nezinye ii-meteorites ze-asteroid. Iqela le-China Antarctic scientific expedition lifumene ii-meteorites ezingaphezu kwe-10,000 e-Antarctica.
Ukuthabatha ii-asteroid meteorites kuyaqondakala kuba kukho iirekhodi ezininzi zee-asteroids eziwela emoyeni zize ziwele emhlabeni. Kodwa amatye avela enyangeni naseMars, kutheni sizithatha? Enyanisweni, kulula ukuyiqonda: kwiminyaka emide yendalo yonke, inyanga kunye neMars zatshayiswa zizidalwa ezincinci zasezulwini (ezifana nee-asteroids, ii-comets) ngamanye amaxesha. Thatha iMars njengomzekelo. Xa kwenzeka impembelelo, lo gama nje umzimba omncinci wasezulwini mkhulu kwaye ukhawuleza ngokwaneleyo, unokuqhekeza amatye aphezu kobuso beMars abe ziingceba. Ukuba i-engile yempembelelo ichanekile, ezinye zezingceba ziya kufumana amandla e-kinetic ukuze zibalekele umxhuzulane weMars zingene kwindawo. "Ziyazulazula" kwindawo yonke, kwaye ezinye iindawo ziya kuthinjwa ngumxhuzulane woMhlaba kunye "nokungqubana" ukuya kumphezulu woMhlaba. Kule nkqubo, ezinye izingceba ezincinci kunye nezingceba ezakhiwe ngokukhululekileyo ziya kutsha emoyeni ngoxinzelelo oluphezulu kunye nobushushu obuphezulu kwaye zigaywe yigesi, kwaye ezinye izingceba ezinkulu eziseleyo kunye nezingceba ezakhiwe ngokuqinileyo ziya kufikelela kumphezulu womhlaba. Zikwaziwa nangokuthi "ngamatye eMars". Ngokufanayo, ii-craters ezinkulu nezincinci ezikumphezulu wenyanga nazo zaphulwa zii-asteroids.
Ekubeni amatye asenyangeni naseMars enokuza emhlabeni, ngaba amatye asemhlabeni angafikelela enyangeni? Kutheni kuthiwa iidinosaur zezona ntlobo zokuqala ukufika enyangeni?
Kwiminyaka emalunga nezigidi ezingama-65 eyadlulayo, iplanethi enkulu enobubanzi obuziikhilomitha ezili-10 kunye nobunzima obuziitoni ezimalunga ne-2 trillion yabetha umhlaba yaza yashiya umngxuma omkhulu. Nangona umngxuma ngoku ugqunywe, awunakuyingcwaba intlekele eyenzeka ngelo xesha. Ngenxa yobukhulu beplanethi, yakhupha "umngxuma" omfutshane emoyeni. Emva kokuwela emhlabeni, kunokwenzeka ukuba inani elikhulu lamatye aqhekekileyo akhutshwe emhlabeni. Njengomzimba wesibhakabhaka osondeleyo kuMhlaba, inyanga inokuthi ibambe amatye oMhlaba aqhekekileyo ngenxa yempembelelo. Ngaphambi kokuba kwenzeke le "mpembelelo", iidinosaur zaziphile iminyaka engaphezu kwezigidi ezili-100, kwaye inani elikhulu lamathambo edinosaur lalisele likho kwi-strata yomhlaba, ngoko asinakuyisusa into yokuba kukho amathambo edinosaur kwi-frata ezaqhekeka enyangeni.
Ngoko ke ngokwembono yesayensi, iidinosaur kusenokwenzeka ukuba zibe zizidalwa zokuqala ukufika enyangeni. Nangona kuvakala ngathi yintsomi, kuyaqondakala ngokupheleleyo yisayensi. Mhlawumbi ngenye imini kwixesha elizayo, sifumana iifosili zeedinosaur enyangeni, kwaye akufanele simangaliswe ngelo xesha.
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