The key lies in a rocky exoplanet's ability to maintain heat.
. Degassing contributes carbon dioxide to the atmosphere and continues the carbon cycle. But older planets might have consumed their radioactive resources and thus may not be able to retain their heat, the scientists explained in a new paper.
"We know these radioactive elements are necessary to regulate climate, but we don't know how long these elements can do this, because they decay over time," Unterborn said."Also, radioactive elements aren't distributed evenly throughout theSo how long can an exoplanet sustain radioactive decay? Because the amounts of radioactive elements on each exoplanet can vary, so can these time frames.
"Under the most pessimistic conditions, we estimate that this critical age is only around 2 billion years old for an Earth-mass planet and reaching 5 [billion] to 6 billion years for higher-mass planets under more optimistic conditions," Unterborn said.
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