grees or more, enougo begin togenerate ts in a process knos ors, received a Nobel Prize. .

    According to ar e enoug to create all ts and spray to terstellar medium as it is kno could eventually coalesce into neems.

    it became possible at last to construct plausible scenarios for   his:

    About 4.6 billion years ago, a great s some 15 billion miles acrossaccumulated in space e. Virtually all of it—99.9percent of tem— to make t of ting materialt  over, ted close enougogeto be joined byelectrostatic forces. t of conception for our planet. All over tesolar system, t grains formed larger and larger clumps.

    Eventually to be called planetesimals. As tured or split or recombined in endless random permutations,but in every encounter todominate t around wraveled.

    It all o groiny cluster of grains to a baby planetsome  to aken only a feens of thousands of years.

    In just 200 million years, possibly less, tially formed, till moltenand subject to constant bombardment 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