Earth has retained heat from its past. Mars is smaller than we are. And so it has more surface compared to its volume. The more surface you have, the more you can radiate away your heat. That's why babies need extra protection for their body temperature in order to protect it.
What happens if Earth’s core is slowing? Neil deGrasse Tyson and comedian Chuck Nice explore the spinning of Earth’s core, the physics of tire pressure, and the science of toast.
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Photo Credit: NASA, Public domain, via Wikimedia Commons
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