By David J. Eicher
50 maximum Mysteries of the Universe is an astronomy buffs dream e-book! This new collectors version from the editors of Astronomy contains the newest examine on astronomys greatest questions. How previous is the universe? Are there different planets like Earth? How do big stars explode? discover solutions to those questions, and more!
50 maximum Mysteries of the Universe has the most recent clinical wisdom concerning the universes starting and finish. discover why antimatter concerns, what function string thought performs in cosmic constitution, and even if parallel universes fairly exist. state-of-the-art technological know-how written in easy-to-understand language makes this collectors merchandise a memento to proportion with family and friends.
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Additional resources for 50 Greatest Mysteries of the Universe (Astronomy Magazine Collectors Edittion)
The high rotation rate would have generated temperatures high enough to melt the entire planet. Unlike earlier models of lunar formation such as fission, capture, or assembly in place, the theory better explains the present rotational speed of the Earth-Moon system. Earth’s new satellite continued growing as it swept up rocky material in orbit around the planet. Infalling bodies in orbit around the Moon also crashed to the surface. Eventually, the Moon cleaned away all debris in its eccentric path around Earth.
Greenland Sea Str ait ar k nm Strait Davis Baffin Island Greenland De Baffin Bay Iceland Area of oldest rocks 44 The Formation of Earth TABLE 2 EVOLUTION OF LIFE AND THE ATMOSPHERE Evolution Origin (millions of years) Atmosphere Humans Mammals Land animals Land plants Metazoans Sexual reproduction Eukaryotic cells Photosynthesis Origin of life Origin of Earth 2 200 350 400 700 1,100 1,400 2,300 3,800 4,600 Nitrogen, oxygen Nitrogen, oxygen Nitrogen, oxygen Nitrogen, oxygen Nitrogen, oxygen Nitrogen, oxygen, carbon dioxide Nitrogen, carbon dioxide, oxygen Nitrogen, carbon dioxide, oxygen Nitrogen, methane, carbon dioxide Hydrogen, helium above by the Sun and from below by active volcanoes on the ocean floor, which continually supplied seawater with the elements of life.
The heavier metallic elements sank toward the center, and the lighter materials rose toward the surface. The core attracted siderophilic, or iron-loving, materials such as gold, platinum, and certain other elements originating from meteorite bombardments during the planet’s early formation. The entire process of segregating the core and mantle took place within the first 100 million years, resulting in a planet that was molten throughout. 26 The Formation of Earth Ou Crust sphere o n e h Ast ne ion zo nsit a r T antle er m w Lo Figure 18 The structure of Earth, showing core, mantle, and crust.