Great Comets（ISBN=9780521646000） 英文原版 下载 网盘 kindle mobi 115盘 pdf pdb rtf

　　Spectacular and mysterious objects that come and go in the

night sky, comets have dwelt in our popular culture for untold

ages. As remnants from the formation of the Solar System, they are

objects of key scientific research and space missions. As one of

nature's most potent and dramatic dangers, they pose a threat to

our safety - and yet they were the origin of our oceans and perhaps

even life itself. This beautifully illustrated book tells the story

of the biggest and most awe-inspiring of all comets: those that

have earned the title 'Great'. It focuses on Great Comets Hyakutake

in 1996 and Hale-Bopp in 1997, which gripped attention world-wide

because, for many, they were the first comets ever seen. For

everyone interested in astronomy, this exciting book reveals the

secrets of the Great Comets and provides essential tools for

keeping up-to-date with comet discoveries in the future.

All-colour guide to the two most beautiful and spectacular comets

in the last few years ? Complete guide to up-coming space missions

to comets ? Annotated resource guide, using print and Internet, for

keeping up to date with comets

1. Great comets and astronomy

2. What makes a comet 'Great'?

3. Great Comet Hyakutake (1996)

4. Great Comet Hale-Bopp (1997)

5. Space missions to comets

6. Comets and cultures

7. Danger from the sky

8. Staying current with comets.

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书籍介绍

Spectacular and mysterious objects that come and go in the night sky, comets have dwelt in our popular culture for untold ages. As remnants from the formation of the Solar system, they are objects of key scientific research and space missions. As one of nature's most potent and dramatic dangers, they pose a threat to our safety--and yet they were the origin of our oceans and perhaps even life itself. This beautifully illustrated book tells the story of the biggest and most awe-inspiring of all comets: those that have earned the title "Great." Robert Burnham focuses on the Great comets Hyakutake in 1996 and Hale-Bopp in 1997, which gripped attention worldwide because, for many, they were the first comets ever seen. He places these two recent comets in the context of their predecessors from past ages, among them the famous Comet Halley. Great Comets explains the exciting new discoveries that have come from these magnificent objects and profiles the spaceprobes to comets due for launch in the next few years. The book even takes a peek behind Hollywood's science-fiction fantasies to assess the real risks humanity faces from potential impacts of both comets and asteroids. For everyone interested in astronomy, this exciting book reveals the secrets of the Great Comets and provides essential tools for keeping up to date with comet discoveries in the future. Robert Burnham has been an amateur astronomer since the mid-1950s. He has been a senior editor of Astronomy magazine (1986-88) and is the author of many books and CD-ROMS, including Comet Hale-Bopp: Find and Enjoy the Great Comet and Comet Explorer.