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It started as a large rotating cloud of dust and gas.This cloud, the solar nebula, was composed of hydrogen and helium produced in the Big Bang, as well as heavier elements produced in supernovas.It is therefore essential to have as much information as possible about the material being dated and to check for possible signs of alteration.Measurements should be taken on samples from different parts of the rock body. video Details)var in Next Video Autoplay Countries=! wikia JWPlayer=:wikia JWPlayer);define('ext.Engine.video.player.Tracking',[ 'ext.Engine.utils.event Dispatcher','ext.Engine.video.player.jwplayer.jwplayer Tracker','ext.Engine.Parser'],function(event Dispatcher,tracker,vast Parser));define( 'ext.Engine.video.player.jwplayer.jwplayer Tracker',['ext.Engine.video.player.player Tracker'],function(player Tracker) );define('wikia.article Video.featured Video.ads',['ext.Context','ext.Engine.Url Builder','ext.Ad Unit Builder','ext.Registry','ext.Provider','ext.Engine.video.article Video Ad','ext.Engine.video.player.Tracking','ext.Engine.Debugger','ext.Engine.Parser','wikia.article Video.featured Video.lagger','wikia.log'],function(ad Context,vast Url Builder,mega Ad Unit Builder,slot Registry,src Provider,article Video Ad,ads Tracking,vast Debugger,vast Parser,fv Lagger,log));define('wikia.article Video.featured Video.lagger',['ext.Context','wikia.lazyqueue',require.optional('ext.Engine.mobile.mercury Listener')],function(ad Context,lazy Queue,mercury Listener));define('wikia.article Video.featured Video.cookies',['wikia.cookies'],function(cookies));require(['wikia.window','wikia.geo','wikia.cookies','wikia.tracker','ext.Context','wikia.article Video.featured Video.data','wikia.article Video.featured Video.ads','wikia.article Video.featured Tracking','wikia.article Video.featured Video.cookies',require.optional('ext.Engine.lookup.a9')],function(win,geo,cookies,tracker,ad Context,video Details,featured Video Ads,featured Video Moat Tracking,featured Video Cookie Service,a9){if(!

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Radiometric dating (often called radioactive dating) is a way to find out how old something is.

Elements exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.

A particular isotope of a particular element is called a nuclide. That is, at some point in time, an atom of such a nuclide will spontaneously change into a different nuclide by radioactive decay.

Meanwhile, the rest of the disc began to break up into rings, with gravity causing matter to condense around dust particles.

Small fragments collided to become larger fragments, including one collection about 150 million kilometers from the center: this would become the Earth.

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