o bevisible to t in 1054 t created tar brigo be seen during trecent ably safe 169,000 light-years away.
Supernovae are significant to us in one otral t be cer—t ted lots of lig no s. ter, but for a very long time nobody could figure out er. t you needed somet—ter even ttest stars—toforge carbon and iron and ts erial. Supernovae provided tion, and it as singular in manner as Fritz Z.
uary in Nature as a “cosmologist and controversialist” and bot certainlyure ’s obituary, “embroiled in controversy for most of his life”
and “put o mucance, and evidence, t tural ory Museum’s treasured fossil of an Arceryx doo tologists, Eart only seeded by life from space but also by many of its diseases, suced at one point t ingnoses rils underneatothem.
It of facetiousness, for a radiobroadcast in 1952. ed out t notanding of pfor , ically begin to expand.
eady-state tantly expanding andcontinually creating neter as it . if stars imploded te s of —100 million degrees 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 bombar