Theoretical calculations suggest that Earth-sized planets could be habitable on their surfaces outside of habitable zones if they

Question

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Thick, hydrogen atmospheres can trap enough heat to potentially keep the surface of an Earth-sized planet warm enough for liquid water, even outside of the traditional habitable zone. This is because hydrogen is a potent greenhouse gas and can create a strong greenhouse effect, insulating the planet.

Theoretical Calculations Suggest That Earth-Sized Planets Could Be Habitable on Their