The Health Physics Society's 'Ask-The-Expert' feature: widening public support through empathy and science

Emily Caffrey1, Jarvis Caffrey1

  • 1Radian Scientific, LLC, Huntsville, AL 35801, United States of America.

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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