Life on an aquaplanet
Boston MA (SPX) Dec 29, 2014 - Nearly 2,000 planets beyond our solar system have been identified to date. Whether any of these exoplanets are hospitable to life depends on a number of criteria. Among these, scientists have thought, is a planet's obliquity - the angle of its axis relative to its orbit around a star. Earth, for instance, has a relatively low obliquity, rotating around an axis that is nearly perpendicular ... more
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