وَجَعَلْنَا سِرَاجًا وَهَّاجًا (13)
(78:13) and placed therein a hot, shining lamp, *10
*10) "A bright, blazing lamp": the sun. The word wahhaj used for the sun means both intensely hot and intensely bright. Hence our rendering. In this brief sentence, allusion has been made to a most wonderful and glorious sign of Allah Almighty's power and wisdom which the sun is. Its diameter is 109 times that of the earth's and its size more than 333,000 tunes that of the earth's. Its temperature is 14,000,000'C. In spite of shining 93,000,000 miles away from the earth, its light and brightness is dazzling, and man can look at it with the naked eye only at the risk of losing his eye-sight. As for its heat, temperature in some parts of the earth reaches 140'F. because of its radiation. It is only Allah Who by His wisdom has placed the earth at the right distance from it, neither it is too hot for being close to it, nor too cold for being very far away from it. For this very reason life of man, animal and vegetable became possible on it. Measureless treasures of energy from it are reaching the earth and sustaining life. It helps ripen our crops to provide sustenance to every creature; its heat causes vapours to rise from the seas, which spread to different parts of the earth by means of the winds and fall as rain. In the sun Allah has kindled such a mighty furnace that has been constantly radiating light, heat and different kinds of rays throughout the entire solar system since millions and millions of years.