第3章 地球的诞生

失眠听书必备……

ThBirthfEarth

Thriginfrpant,ikthatfthnivrsitsf,rainsshrinystry.

Hvr,thrghthffrtsfastrnrsansgists,havtnrstansfthvntsthattthfratinfrpant.

Thbginningfrsarsystanbtrabaktavastfstangasknasthnba.

Thisnba,ihspriariypsfhyrgn,hi,anthrhavirnts,starttapsnritsgravity.

Asthnbaaps,itbgantrtatanvntayfattnintaisk-shapstrtrknasaprtpantaryisk.

Withinthisprtpantaryisk,sarstpartisbgantptgthrttrstatiattratin.

Asthsstaggrgatsntintgrthyfrargranargrbjtsknaspantsias.

Sfthspantsiasntintianrgthahthr,vntayfringthfrrkypantsfrsarsyst:Mrry,Vns,Earth,anMars.

ThfratinfEarthisthghtthavrrabt4.5biinyarsag,ringapriknasthLatHavyBbarnt(LHB).

Thisbbarnt,ihrraftrthinitiafratinfthpants,sasbyabarragfastrisan

tsthatpthsrfafEarthfrsvrahnriinyars.Thisbbarntisbivthavpay

ariarinshapingthsrfafatrsfEarthanpssibyvnntribtingtthvpntfif.

OnfthstsignifiantvntsinthhistryfrpantsthisinbtnEarthanThia,aMars-siz

bjtbivthavrrabt4.5biinyarsag.

Thisisinisthghtthavratthnan