{"id":503,"date":"2007-01-18T22:56:24","date_gmt":"2007-01-19T03:56:24","guid":{"rendered":"http:\/\/www.spaceelevatorblog.com\/?p=503"},"modified":"2007-01-24T01:41:28","modified_gmt":"2007-01-24T06:41:28","slug":"leaving-the-planet-by-space-elevator","status":"publish","type":"post","link":"https:\/\/www.spaceelevatorblog.com\/?p=503","title":{"rendered":"Leaving The Planet by Space Elevator"},"content":{"rendered":"

<\/a>This is a long overdue review of this book.\u00a0 Leaving the Planet by Space Elevator<\/em> is co-authored by Dr. Bradley Edwards and Philip Ragan and is intended, according to the blurb about it on Amazon.com, to be \u201cAn easy guide to the most exciting development in space travel since the rocket. Stripped of the technical jargon, this is a layman\u2019s guide to the breathtaking developments surrounding the space elevator: a plan to string a 100,000 km from Earth to space, revolutionizing space access.\u201d<\/p>\n

The book certainly succeeds in doing this.\u00a0 Anyone who reads this book, assuming they have at least the intelligence of the average 8th grader and are paying attention, will be able to understand a) what a space elevator is b) how it would be constructed c) how it would work d) why it would work (i.e., the physical principles involved) and e) why it is such a great idea.<\/p>\n

Edwards and Ragan discuss everything from the practical issues one will run into in building their version of a space elevator (for example, you need the capability to get 80 tons of parts into space, assemble\u00a0them together and then lift it all\u00a0to the appropriate point in geosynchronous orbit), to where it could be actually be anchored on earth.\u00a0 This latter point is most interesting; the authors specify six locations where the factors of nearness to the equator, lack of storms and lack of lightning strikes favor the location of a Space Elevator earthport; the largest being on the equator and west of South America, but also including three locations in the Atlantic Ocean and two locations in the Indian Ocean.\u00a0 As an aside, I found the maps of places on our planet which have\/do not have storms and lightning strikes over the measured period to be fascinating.<\/p>\n

The book also addresses a common misunderstanding; the example of whirling an object attached to a string around your hand (or head) is often used to indicate how\/why the elevator cable would remain straight.\u00a0 This is correct of course, but people often misinterpret this to mean that anchoring the cable to the earth is necessary in order to keep it from flying away into space; as if there are going to be some gigantic clamps holding on to the end of the cable (as the hand is holding on to the end of the string).\u00a0 I still use the \u2018object-on-a-string\u2019 example, but emphasize that it is gravity, acting on the entire cable (rather than on just the endpoint) which is holding it in place; i.e. it really is a cable hanging from geosynchronous orbit.\u00a0 This book makes this same point in a very easy to understand way.<\/p>\n

This is truly a fine book and is a wonderful introduction to the potential of a Space Elevator.\u00a0 Highly, highly recommended.<\/p>\n

Oh, and what\u2019s the difference between this book and the previous effort (The Space Elevator<\/a>) by Dr. Edwards and Eric Westling?\u00a0 I think you can summarize it this way; The Space Elevator<\/em> is more technical while Leaving the Planet by Space Elevator<\/em> is more current.\u00a0 I have both books and am glad I do \u2013 I refer to both of them often.<\/p>\n

Leaving The Planet by Space Elevator<\/em> is available from Amazon.com<\/a> and Lulu.com<\/a>.\u00a0 For you eBook afficianados, Lulu.com also offers the book in downloadable format.<\/p>\n

(Click on the thumbnail to see a larger version of the books front and back cover.)<\/p>\n

Update January 20, 2007 – There is a website dedicated to this book too – you can find it <\/em>here<\/em><\/a>.<\/em><\/p>\n

Update January 24, 2007 – Well, I stand corrected.\u00a0 I had written in this post that it was not really necessary to clamp the earthbound end of the tether in order to hold it to the planet – the centrifugal force pulling the tether outwards (and upwards) and the gravitational force pulling the tether downwards would be in balance.\u00a0 But, as both Ben Shelef and Dr. Brad Edwards have informed me, there IS a slight, outwards (upwards) pull on the tether; otherwise when the climber was put onto the ribbon, it would have the effect of pulling the ribbon downwards.\u00a0 So, to correct my earlier posting, yes, there must be a clamp holding the space elevator to earth; otherwise the tether will fly away from the planet.\u00a0 But it’s not much – only about 20+ tons worth (in a system massing more than 1400 tons).\u00a0 Once a 20 ton climber is placed on the ribbon, the system is then, essentially, in balance.\u00a0 I apologize for my mistake…<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

This is a long overdue review of this book.\u00a0 Leaving the Planet by Space Elevator is co-authored by Dr. Bradley Edwards and Philip Ragan and is intended, according to the blurb about it on Amazon.com, to be \u201cAn easy guide to the most exciting development in space travel since the rocket. Stripped of the technical […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-503","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=\/wp\/v2\/posts\/503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=503"}],"version-history":[{"count":0,"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=\/wp\/v2\/posts\/503\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.spaceelevatorblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}