50 & 100 Years Ago | Nature

Access through your institution Buy or subscribe 50 YEARS AGO On the morning of November 3, the U.S.S.R. announced from Moscow the launching of the second artificial Earth satellite — about

a month after the launching, on October 4, of the first … For the first time in history, a living mammal from the Earth is travelling in an Earth satellite, for the second one is carrying a

dog: at the time of writing it was “calm and behaving normally” according to Russian reports … The launching of the second satellite is staggering enough in itself; but some Russian

scientists have stated that it is hoped that the dog will return alive. They claim to have solved the immensely difficult 're-entry' problem; that is, the safe passage through the

atmosphere in spite of the great heat generated through friction. This possibility will be watched with the keenest interest. The greatest peril which the animal is facing is the absence, or

considerable reduction in strength, of gravity; also it is conceivable that cosmic rays at that height may have a fatal effect on the nervous system. This is a preview of subscription

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ARTICLE 50 & 100 Years Ago. _Nature_ 450, 181 (2007). https://doi.org/10.1038/450181a Download citation * Published: 07 November 2007 * Issue Date: 08 November 2007 * DOI:

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