Earthy exoplanets

摘要

Scientists have created rap sheets for six planets beyond the solar system, orbiting three distant stars. One star hosts a system with three super-Earth planets, heavier than Earth but lighter than gas giants. Another harbors a 3.6-Earth-mass planet within its habitable zone, scientists from Europe report online August 17 at arXiv.org. That planet, HD 85512b, described in a second paper at arXiv.org, could be habitable if clouds cover more than half its surface.