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Ward  \nRefuges for Life in a  \nHostile Universe  \nNEARLY EVERYTHING seems to have gone wrong on this hapless wor ld. Pummeled  \nCopyright 2001 Scientific American, Inc.  \nby comets, fried by nearby supernovae and on the verge of being catapulted into deep space by a looming gas giant, the barren planet in this artist’s conception might be more typical of rocky bodies in our galaxy than Earth is.  \nIn science-fiction stories, interstellar travelers visit exotic locales in the Milky Way and meet with interesting aliens. You name the place, and someone has put a civilization there: the galactic center, a globular cluster, a star-forming region, a binary star system, a red dwarf star. Part of the reason that sci-fi writers have  \nto be so inventive is that scientists keep spoiling the fun. It used to be quite respectable to speculate about intelligent beings on the moon, Mars, Venus, Jupiter or even the sun, but nowadays canal-building Martians and cool oases inside the sun are merely quaint notions. As writers go ever farther afield to situate their characters, scientists are not far behind. Researchers are now casting a skeptical eye on musings about the prevalence of intelligent life throughout the Milky Way. Just as most of the solar system is hostile to multicellular organisms, the same maybe true of much of the galaxy.  \nWithin a given planetary system, astronomers describe the optimal locations for life in terms of the circumstellar habitable zone (CHZ). Although its definition has varied, the CHZisgenerally considered to be the region around a star where liquid water can persist on the surface of a terrestrial, or Earth-like, planet for at least a few billion years. The zone is ring-shaped [see illustration on opposite page]. Its inner boundary is the closest that a planet can orbit its host star without losing its oceans to space. In the most extreme case, a runaway greenhouse effect might take hold and boil off the oceans (as happened on Venus). The outer boundary is the farthest a planet can roam before its oceans freeze over. From basic stellar theory, astronomers can estimate the size of the CHZ for a star of any mass [see “How Climate Evolved on the Terrestrial Planets,” by James F. Kasting, Owen B. Toon and James B. Pollack; Scientific American, February 1988] .  \nObviously, many other factors also contribute to the hab-  \n■ What does a planet need to support complex life-forms? Astronomers have generally focused on the stability of surface water—which is possible only within a certain range of distances from the planet’s star, a region known as the circumstellar habitable zone. But in discovering extrasolar planets over the past five years or so, researchers have come to appreciate a broader set of conditions.  \n■ Ideally, the star and its planetary retinue should orbit within a certain range of distances from the center of the galaxy. Too far, and the nebula from which the star emerged will lack the heavy elements out of which planets are made. Too close, and hazards such as orbital instabilities, cometary collisions and exploding stars will nip ecosystems in the bud. The sun’s position is just right.  \n■ All this suggests that complex life is rare in the galaxy.  \n Overview/Habitable Zone   \nitability of a planet, including the ellipticity of its orbit, the company of a large moon and the presence of giant planets, let alone the details of its biology. But if a planet orbits outside the zone, none of these minutiae is likely to matter. Similarly, it doesn’t make much difference where the CHZ is located if the planetary system as a whole resides in a hostile part of the galaxy.  \nThus, in 1999 we proposed the concept of a galactic equivalenttothe CHZ: the galactic habitable zone (GHZ). The GHZ definesthe most hospitable places in the Milky Way—those that are neither too clo","cbCaigQ3xMdFlYWy","https://ap.wps.com/l/cbCaigQ3xMdFlYWy","pdf",1781061,"English","# Circumstellar Habitable Zone (CHZ)\n## CHZ边界与水的长期存在条件\n# Galactic Habitable Zone (GHZ)\n## GHZ的定义与提出背景\n## 金属丰度与巨行星发现的影响\n# Where’s the Wherewithal?\n## 可建造物质与宇宙威胁的双重制约","[{\"question\":\"什么是环恒星宜居带（CHZ），它如何定义？\",\"answer\":\"CHZ指恒星周围的一段区域，在其中液态水可在类地行星表面维持至少数十亿年。它用内外边界来限定：内侧避免海洋因空间流失而消失，外侧避免海洋冻结。\"},{\"question\":\"为什么需要在银河尺度上考虑宜居性（GHZ）？\",\"answer\":\"文章指出，即使CHZ位置合适，若整个行星系统位于银河中更敌意的区域，复杂生命仍可能难以生存。因此在1999年提出将银河视为更广阔的宜居环境来评估。\"},{\"question\":\"GHZ边界由哪些关键因素决定？\",\"answer\":\"文章给出两个要求：一是形成宜居行星所需的物质供给，二是与宇宙威胁保持足够隔离。材料来源涉及宇宙化学元素从大爆炸到恒星核合成的演化，威胁则来自爆炸恒星与天体近距离相遇等。\"}]","Refuges for Life in a Hostile Universe | PDF"]