When temperature goes below freezing, the ground becomes firm, not sticky and wet. The Nokota Horse’s coats gets fluffy and warm, the top layer is no longer wet and messy.
The surface temperature at a Nokota horse’s coat is well below zero, but less than an inch underneath the skin still holds body temperature.
Cold fresh air is denser, every breath contains more oxygen atoms, it is vitalizing. The brain sharpens and senses waken.
The light under the icy blue sky is weak but polarized and distinct. Ideas radiates from one brain to another, from horse to human, from human to horse. Together we smile.
Matter is energy.
Matter wants to clump together and transform into energy.
Energy wants to achieve equilibrium, so it spreads out using two tricks; convection and radiation.
Convection needs a medium, like air or water, to rub off heat from one atom to another. In space between planets and stars, there is no convective medium, only radiation.
Radiation is photons, mysterious waves of tiny energy packages susceptible to gravity, rushing thru space at three hundred thousand kilometers per second. Depending on wavelengths we call it radio waves, micro waves, infra red light, visible light, ultra violet light, x-rays or gamma-rays. The result is a flow of thermal energy, from a warm place to a cold place.
At night when our home is faced away from the sun and in winter when the sun is very low even at noon, the warm Earth radiates heat out into cold space.
Clouds of water vapor may absorb some of the convective heat, reflect and scatter some of the radiation and regain thermal energy back to the atmosphere and to the ground.
At cloudless days and nights nothing much, except greenhouse gases like methane and carbon dioxide, reduces the heat loss, so the temperature here on the ground drops.
Tough horses like it cold as well as hot, just like some girls like Jupiter as well as the Sun.