Worlds Without End: The Exploration of Planets Known and Unknown
In this highly readable yet solidly scientific book, distinguished planetary scientist John S. Lewis brings us the latest results of the search for new planets in our galaxy. Worlds Without End is both a grand tour of the solar system and a fascinating look at the many theories of planet formation and of life on earth. Lewis explains how planets form, what they are made of, and how scientists know what they know about them. Lewis examines the evidence for the existence of planets orbiting distant suns, including gigantic planets that orbit their suns even closer than Mercury circles our own sun. By examining what we know about the planets in our own solar system, Lewis shows how that knowledge, built up over decades of astronomical observations, robot explorers, and manned space missions, can help us determine what kinds of planets those distant ones are likely to be, and what kind of life we can expect to find on them.
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The Plurality of Worlds 7
Worlds As We Know Them 29
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accretion ammonia asteroids atmosphere atoms axial tilt billion bodies brown dwarf carbon chains chemical close collision comets composition condense cool core crust dense disk distance dust Earth Earthissimo Earthlet Earthlike eccentric orbits eccentricity elements energy escape velocity Europa galaxy Galilean satellites gas-giant planets gases giant planets globular clusters gravitational heat source helium hydrogen impact interstellar iron Jovian planets Jupiter Jupiter masses Jupiter's kilometers per second layer less liquid water luminosity main sequence main sequence stars Mars massive material melt Mercury metal methane minerals molecules Moon Neptune nitrogen ocean orbital eccentricity orbital period organic matter oxide oxygen percent perihelion planetary systems possible pressure radiation radioactive range resonance rock rocket rocky rotation Saturn silicates silicon solar masses Solar Nebula Solar System solid space spacecraft speed spin stellar sulfide sulfur supernova surface temperatures tidal forces tion ultraviolet Uranus Venus volatiles water vapor worlds