Assertion: solar system's atmosphere | /r/CapableOf | keep heat
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Source sentences:
text: Its magnetic field is only about 1% that of Earth’s, and it’s very thin atmosphere means that it is hot during the day (up to 430°C) and freezing at night (as low as -187 °C) because the atmosphere can neither keep heat in or out.
text: Mercury is closest to the sun, and while it gets most of the heat, it doesn’t have an atmosphere to hold any of the heat and it expels it back out.