Robert Frost’s classic 1923 poem ”Nothing Golden Can Stay” is certainly true for planets that are in the habitable zone — or shall we say the golden zone — around their parent stars. A planet’s lease on life runs out when the evolving star grows too hot for the world hold onto water for sustaining life as we know it. With increasing stellar luminosity, the habitable zone sweeps outward beyond the planet’s orbital radius, leaving paradise worlds to bake to death as surviving extremophliles burrow underground. What’s sobering is that Earth has already spent 70 percent of its habitable years inside the sun’s golden zone. And it took that long for intelligent life to appear on the surface.
See complete article at Discovery.com - click link below........
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