ScienceDaily: Stars News |
| Companion planets can increase old worlds' chance at life Posted: 01 Aug 2014 06:12 AM PDT Having a companion in old age is good for people -- and, it turns out, might extend the chance for life on certain Earth-sized planets in the cosmos as well. Planets cool as they age. Over time their molten cores solidify and inner heat-generating activity dwindles, becoming less able to keep the world habitable by regulating carbon dioxide to prevent runaway heating or cooling. |
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