245 00|a Origins. |n Episode one, |p Earth is born.

246 22|a Earth is born.

260 __|a Alexandria, VA : |b PBS, |c 2004.

500 __|a Copyright permission expires 08/07/08.

500 __|a Title from web site description.

511 0_|a Host : Neil deGrasse Tyson.

520 __|a Who would have predicted that a hot spot left over from the Big Bang would eventually lead to the Earth, the cosmos — and to us? NOVA covers all the exciting steps in between in this four-part miniseries about the beginnings of Earth, life and the universe.
The first episode shows that ancient cataclysms made our planet what it is today. Ironically, says Neil deGrasse Tyson, “Earth became a hospitable planet only after a series of devastating disasters in its early years.” Chief among these was a titanic collision between Earth and a Mars-sized object, an impact so immense that it obliterated the colliding object and part of the Earth itself to create a dense ring of orbiting material that eventually collected into the moon. The collision tilted Earth’s axis at an angle of 23.5 degrees — enough to cause the seasons. Other milestones in this eventful era include the formation of continental crust and the precipitation of water out of a hellish atmosphere. All of these events happened in a remarkably short period of time, perhaps in the first few hundred million years of Earth’s 4.5-billion-year history. This new picture of our planet’s formative era implies that Earth may have reached a habitable stage much earlier than previously thought. 60 minutes.

521 __|a Middle school to adult.

546 __|a Closed captioned for the hearing impaired.

650 _0|a Cosmology.

650 _0|a Big bang theory.

650 _0|a Earth |x Origin.

700 1_|a Tyson, Neil deGrasse

710 2_|a WGBH (Television station : Boston, Mass.)

710 2_|a PBS

730 0_|a Nova (Television program)

856 42|a http://www.pbs.org/wgbh/nova/origins/