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The primary reason Mars is so much colder than the Earth is that Mars receives less than half of the of the energy from the sun as Earth does. This is because Mars is further away from the sun than Earth is. Mars' atmosphere is over 90% CO2, but Mars' total atmosphere is only about 0.6% that of Earth. Meaning that Mars has very little atmosphere of any kind to speak of, and so its atmosphere provides only negligible insulation to the planet.

The net result is a very cold planet with very low atmospheric pressure. From an Earthling's perspective, Mars is no more hospitable than the vacuum of space.

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Q: Why mars is cold despite of high percentage of atmospheric CO2?
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