The Sun is the focal point of this primary energy flow. Contrary to common belief, the sun is neither hot nor luminous. It merely radiates characterless primary energy which is CONVERTED INTO HEAT AND LIGHT BY CERTAIN ELEMENTS IN OUR UPPER STRATOSPHERE. True, the Sun does radiate enough energy to create the temperatures measured by scientists, but the actual heat conversion does not occur on the Sun itself! It only seems that way because we are viewing it through Earth's conversion zone (that is, our upper atmosphere).
When seen from any planet with an atmosphere, the other planets and stars would look similar to the way they look to us on Earth. But in outer space everything appears cold and dark; the planets glow very faintly, due to the refraction of a very small part of the energy flow, but most of the flow is directed downwards to the planets' surfaces. The light from stars and planets is not transmitted as light. It is a reflected (or, in the case of stars, a direct) flow of energy that is changed into light in Earth's upper stratosphere in the same way as the Sun's energy.