Rare Earth

Name: Rare Earth
Brand: Springer Nature
SKU: 9780387218489
Availability: InStock

Rare Earth

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Springer Nature

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9780387218489

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In November 12, 2002, Dr. John Chambers of the NASA Ames Research Center gave a seminar to the Astrobiology Group at the University 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 deceptively simple question: How often would newly forming planetary systems produce Earth-like planets, given a star the size of our own sun? By Earth-like Chambers meant a rocky planet with water on its surface, orbiting within a stars habitable zone. This not-too-hot and not-too-cold inner region, relatively close to the star, supports the presence of liquid water on a planet surface for hundreds of million of yearsthe time-span probably necessary 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 programs through arrays of powerful computers. The results presented at the meeting were startling. The simulations showed that rocky planets orbiting at the right distances from the central star are easily formed, but they can end up with a wide range of water content. Earth seems to be quite a gema rocky planet where not only can liquid water exist for long periods of time, but where water can be found as a heathy oceanfulnot too little and not too much. Our planet seems to reside in a benign region of the Galaxy, where comet and asteroid bombardment is tolerable and habitable-zone planets can commonly grow to Earth size. Such real estate in our galaxyperhaps in any galaxyis prime for life. And rare as well.

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