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The Evolution of Worlds

By Percival Lowell
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Science - Physics

About This Book

A sequence of lectures surveys astronomical evidence and theories about the origin and lifecycle of planetary systems, proposing that planets arise from dark nebulous material and frequently involve energetic events that give rise to bodies and satellites. It brings together observations—nebulae, stellar and planetary spectra, meteorites, orbital tilts, and surface features—to describe accretion, collision, capture, and differentiation processes. The text contrasts inner rocky and outer gaseous worlds, traces atmospheric and climatic development, outlines stages from self-sustained to sun-supported existence, and considers mechanisms of planetary decline, while appendices address technical topics such as meteoric orbits, planetary densities, and the circularization of orbits.

About the Author

Lowell, Percival portrait

Percival Lowell

Percival Lowell was an American astronomer, author, and advocate for the existence of life on Mars, known for his influential works on the subject. His book "Mars and Its Canals" presents his observations and theories about Martian canals, which he believed were evidence of intelligent life. In addition to his astronomical pursuits, Lowell explored cultural themes in his travel writings, such as in "Noto: An Unexplored Corner of Japan," where he reflects on the landscapes and traditions of Japan. His contributions to both science and literature have left a lasting impact on the understanding of planetary science and cultural exploration.

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