Rare Earth (e-bok)
Fler böcker inom
Format
E-bok
Filformat
PDF med Adobe-kryptering
Om Adobe-kryptering
PDF-böcker lämpar sig inte för läsning på små skärmar, t ex mobiler.
Nedladdning
Kan laddas ned under 24 månader, dock max 3 gånger.
Språk
Engelska
Utgivningsdatum
2007-05-08
Förlag
Springer New York
ISBN
9780387218489
Rare Earth (e-bok)

Rare Earth (e-bok)

Why Complex Life is Uncommon in the Universe

E-bok (PDF - DRM), Engelska, 2007-05-08
279
Laddas ned direkt
Läs i vår app för iPhone, iPad och Android
Finns även som
Visa alla 1 format & utgåvor
n November 12, 2002, Dr. John Chambers of the NASA Ames - search Center gave a seminar to the Astrobiology Group at the OUniversity of Washington. The audience of about 100 listened with rapt attention as Chambers described results from a computer study of how planetary systems form. The goal of his research was to answer a dec- tively simple question: How often would newly forming planetary systems produce Earth-like planets, given a star the size of our own sun? By "e;Ear- like"e; Chambers meant a rocky planet with water on its surface, orbiting within a star's "e;habitable zone. "e; This not-too-hot and not-too-cold inner - gion, relatively close to the star, supports the presence of liquid water on a planet surface for hundreds of million of years-the time-span probably n- essary for the evolution of life. To answer the question of just how many Earth-like planets might be spawned in such a planetary system, Chambers had spent thousands of hours running highly sophisticated modeling p- grams through arrays of powerful computers. x Preface to the Paperback Edition The results presented at the meeting were startling. The simulations showed that rocky planets orbiting at the "e;right"e; distances from the central star are easily formed, but they can end up with a wide range of water c- tent.
Visa hela texten

Kundrecensioner

Har du läst boken? Sätt ditt betyg »

Bloggat om Rare Earth