E is for Energy

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A constant energy output from the star is necessary for life to exist and thrive (theoretically). If the star's energy output suddenly decreases, even for a relatively short while, all the water on the planet would freeze. This situation is irreversible, since when the star resumes its normal energy output, the planet's now-white surface will reflect most of this energy, and the ice will never melt.





Conversely, if the stars energy output increases for a short while, all the oceans will...