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... No. 87: May-Jun 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The earth: a doubly charmed planet In SF#85, we learned that the evolution of advanced life forms on earth may have depended upon the protective influences of Jupiter and Saturn. These two giant planets can gravitationally deflect potentially devastating asteroids and comets away from the earth. It seems now that we are doubly lucky! Computer runs demonstrate that the presence of our large moon has stabilized the earth ... s spin axis down the eons. Presently, the earth's spin axis makes an angle of 23.5 with the plane of the earth's orbit (its "obliquity"). The well-known result is our yearly procession of seasons. Without the steadying effect of the moon, however, the earth's obliquity would probably have swung chaotically over much larger values. Such extreme changes would have been inimical to the development of life, particularly advanced life. As a case in point, the polar ... Science Frontiers ONLINE No. 87: May-Jun 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The earth: a doubly charmed planet In SF#85, we learned that the evolution of advanced life forms on earth may have depended upon the protective influences of Jupiter and Saturn. These two giant planets can gravitationally deflect potentially devastating asteroids and comets away from the earth. It seems now that we are doubly lucky! Computer runs demonstrate that the presence of our large moon ...
Terms matched: 3 - Score: 461 - 15 May 2017 - URL: /sf087/sf087a04.htm
... Undecomposed Organic Matter ESB5 Living and Fossil Marine Organisms Found Far Inland ESB6 Living Organisms and Recent Fossils at Very High Altitudes ESB7 Growth Structures on Marine Organisms and Their Fossils ESB8 Animals Entombed in Rocks ESB9 Living Organisms at Great Depths ESB10 Fossils of Warm-Climate, Light Dependent Organisms Found in the Polar Regions ESB11 Time-Wise Anomalous Fossils ESB12 Skipping in the Fossil Record ESB13 "Special" Nature of Fossils ESC ANOMALOUS CHEMICAL PHENOMENA IN GEOLOGY ESC1 Chemical Anomalies in the Stratigraphic Record ESC2 Chemical Anomalies in Igneous and Metamorphic Rocks ESC3 Surface Films ... ESC16 Methane Anomalies ESD DEPOSITS OF REMARKABLE SIZE ESD1 Bone Caves, Bone Caches,... ESD2 Bone Beds, Fish Beds,... ESD3 Sedimentary Deposits of Exceptional Volume ESD4 Historical Evidence for Large Scale Flooding ESD5 Recent Large Reductions of Polar Ice Cover ESD6 Giant Basalt Flows and Traps ESD7 Giant Accumulations of Oil ESD8 Giant Erratics and Megabreccias ESD9 Deposits of Great Areal Extent ESI INCLUSIONS ESI1 Inclusions in Crystals ESI2 Microdebris ESI3 Erratic Boulders, Stones, and Mineral Patches ESI4 Anomalous Amber Inclusions ESI5 Microfossil-Like Inclusions ESI6 Oil in ... Fossil Coral Reefs ETE3 Terraces along Rivers, Submarine Canyons, Sea-Floor Channels ETE4 Inland, High-Level Terraces and Erosion Surfaces ETE5 Periodically Created Beach Terraces ETH GUYOTS, PLATEAUS, UNUSUAL MOUNTAINS ETH1 Flat-Topped Seamounts ETH2 Anomalous Oceanic Plateaus ETH3 Mountain Curiosities ETL PLANET-SCALE TOPOGRAPHIC ANOMALIES ETL1 Land-Water Distribution ETL2 Anomalies of Island Arcs ETL3 Patterns of Lineaments ETL4 Relative Velocities of Continents ETL5 Indications of an Expanding Earth ETL6 Continental Fits -- Good and Bad ETL7 Topographical Anomalies and Continental Drift ETM MOUNDS AND HILLS ETM1 Mima ...
Terms matched: 3 - Score: 397 - 15 May 2017 - URL: /cat-geol.htm
... water gushing forth from deep-sea vents. We will call them "geochemical creatures" to separate them from the "photosynthetic creatures" we are more familiar with. But, in principle at least, there could also be "Carnot creatures", whose metabolisms depend upon temperature differences like almost all human-built engines. Some bizarre animal, such as a meter-long tube worm, could plant one end on a hot rock surface and dangle the other in cold seawater to reject waste heat from its Carnot engine. ... as D. Jones comments below, Carnot creatures would be adaptable to many more habitats in the universe than photosynthetic creatures, which must have a sun with a very specific electromagnetic spectrum. "Many worlds, from distant 'brown dwarf' stars to the satellites of giant planets, may have internal heating but no effective 'Sun'. If Carnot life is possible, it may well have evolved in such dark and distant places -- making life abundant throughout the Universe. Indeed, our distant descendants may be able to harness ... biochemistry to sustain themselves on geothermal or residual browndwarf warmth when the Sun finally grows dim." (Jones, David; "The Dark Is Light Enough," Nature, 385:301, 1997.) Comments. To our knowledge, those who search for extraterrestrial life do not consider the possibility of Carnot creatures and wouldn't recognize them if they stumbled across them or their signals. For example, Carnot creatures might emit infrared signals rather than radio waves; and they might be immense in size. (See related ...
Terms matched: 3 - Score: 358 - 15 May 2017 - URL: /sf111/sf111p08.htm
