Titlebook: Life in the Universe; Expectations and Con Schulze-Makuch Dirk,Louis N. Irwin Textbook 20041st edition Springer-Verlag Berlin Heidelberg 20

脱水

1. Introduction,in the universe other than on Earth. But there are compelling reasons to assume that life exists pervasively throughout the cosmos. That assumption is derived from empirical observations on the nature of the universe and the natural laws that govern it, from analysis of the history and properties of

不朽中国

2. Definition of Life,ing systems use compounds that are abundant in the surrounding environment and processes that are not intrinsically different from reactions that occur abiologically. There does not appear to exist a single characteristic property that is both intrinsic and unique to life. Rather we have to argue th

drusen

过分

敌意

Congestion

腐蚀

7. Habitats of Life,perience we know that life does exist on the surface of a planet, in its subsurface, and transiently at least in the atmosphere. Where it is present, it exists in a surprising diversity and in a variety of microhabitats, from deep caverns (Hose et al. 2000, Melim et al. 2001) to hydrothermal fluids

壮观的游行

动物

9. Signatures of Life and the Question of Detection,raterrestrial life, of course, would be recovery of actual specimens or their fossils. For the next one or two decades, the possibility of obtaining such direct evidence is almost surely restricted to samples from Mars and Venus. So detection of life beyond our nearest neighbors will be dependent fo

JOG

1610-8957 s and limitations for life on other worlds. This study examines each of these parameters in crucial depth and makes the argument that life forms we would recognize may be more common in our solar system than many assume. It also considers, however, exotic forms of life that would not have to rely on