Helge Kragh 
The Moon that Wasn’t [PDF ebook] 
The Saga of Venus’ Spurious Satellite

Ủng hộ

The planet Venus is the closest neighbour to the Earth and in several respects similar to our globe. It revolves around the Sun at an average distance of 0. 72 astronomical units, in an elliptical orbit of eccentricity 0. 007. The corresponding 3 numbers for the Earth are 1 and 0. 017. The mean density of Venus is 5. 2 g/cm , 3 that of the Earth 5. 5 g/cm . Venus’ acceleration of gravity at its equator is 8. 9 2 2 m/s , compared with 9. 8 m/s at the Earth. The escape velocity is 10. 4 km/s, while the corresponding ?gure of the Earth is 11. 2 km/s. Although the mass of Venus is somewhat smaller than that of the Earth – the ratio is M /M =0. 815 V E – the diameters of the two planets are almost the same. In other words, Venus is indeed a sister planet of the Earth. In earlier times, when almost nothing was known about the physical con- tions of Venus, the similarity appeared even stronger than today. Not only was Venus’ period of rotation thought to be close to that of the Earth, it wasalso p- sible (and indeed common) to imagine intelligent life on Venus.

€96.29
phương thức thanh toán

Mục lục

A moon or not? A century of confusion.- From climax to anticlimax.- Contemporary analysis and criticism.- A spurious but persistent satellite.- Closure: the discussion of the 1880s.- Conclusion, and a note on the satellites of Uranus.

Mua cuốn sách điện tử này và nhận thêm 1 cuốn MIỄN PHÍ!
Ngôn ngữ Anh ● định dạng PDF ● Trang 199 ● ISBN 9783764389093 ● Kích thước tập tin 3.8 MB ● Nhà xuất bản Springer Basel ● Thành phố Basel ● Quốc gia CH ● Được phát hành 2008 ● Có thể tải xuống 24 tháng ● Tiền tệ EUR ● TÔI 2205929 ● Sao chép bảo vệ DRM xã hội

Thêm sách điện tử từ cùng một tác giả / Biên tập viên

605 Ebooks trong thể loại này