dment from all t remained floating about.
At t, about 4.5 billion years ago, an object to Eart enougerial to form a companion sp ist, terial self into a single clump, and o t companions us yet. Most of terial, it ist, came from t, not its core, ally, is almost aled as a recent one, butin fact it proposed in t t it is people paying any attention to it.
a ts eventual size, it oform an atmosply of carbon dioxide, nitrogen, metof stuff t e from te of a green, t en a toesomehow life did.
For t 500 million years tinued to be pelted relentlessly bycomets, meteorites, and otic debris, er to fill ts necessary for tion of life. It and yet some going. Some tiny bag of cce. e were on our way.
Four billion years later people began to our story next takes us.
PARt II ture and Nature’s la Ne.
-Alexander Pope