Ukutholwa okusha kwesistimu sonozungezilanga

Amabala amancane e-graphite kumakristalu e-zircon ase-Australia (1) atholwe isazi sokuma komhlaba saseMelika uMark Harrison (XNUMX) awashintshi nje kuphela imibono yangaphambilini ngemvelaphi yokuphila eMhlabeni. Baphinde basiphoqelele ukuthi siguqule umbono wethu ngesimiso sonozungezilanga...

1. Umkhondo we-Biogenic eminyakeni eyizigidi eziyizinkulungwane ezingu-4,1 edlule

Okuningi! Imikhondo ye-biogenic eyatholwa usosayensi ematsheni ihlehlela emuva eminyakeni eyizigidi eziyizinkulungwane ezingama-4,1. Lokhu kushintsha ukujola kwempilo emhlabeni wethu ngeminyaka eyizigidi ezingama-300 edlule.

Inkinga ukuthi izimo ezazikhona eMhlabeni ngaleso sikhathi zazingafanele neze ukudalwa noma ukugcinwa kokuphila. Ngaleso sikhathi, kwakunesihogo sangempela lapha, esivutha udaka olushisayo nezintaba-mlilo, ezihlale zigcwele imfucumfucu yasemkhathini (2). Pho kungani?

Sam Uhlelo lwelanga (3) phela akamdala kakhulu. Ngokusho kwemibono yakudala, yaqala ukwakheka kusuka efwini lothuli lwe-cosmic namadwala adilika ngaphansi kwethonya lamandla adonsela phansi, okwenza iLanga eminyakeni engaba yizigidi eziyizinkulungwane ezingu-4,6 edlule. Khona-ke, njengoba ifu elizungeze inkanyezi liphola, amaplanethi aqala ukwakheka.

2. I-Proto-Earth - ukubona ngeso

3. Amaplanethi esimiso sonozungezilanga, iNyanga neLanga

Esimeni sokutholwa kuka-Harrison, sekuyisikhathi sokudala izimo ezifanele zokuvela kwempilo, ikakhulukazi njengoba amamodeli endabuko ekhuluma ngamabhomu amakhulu ase-asteroid ahlukumeza uhlelo lwe-Earth-Moon.