Quite early in history people understood that if the sun did not shine ...

Quite early in history people understood that if the sun did not shine, everything would remain dark and cold and life would come to an end. What is the sun made of and how can it keep shining on and on and never stop? Asimov takes us through the discoveries of Galilieo, Copernicus, Cassini, Newton, Helmholtz and other scientists, to the discovery of nuclear energy, which later led to the discovery of hydrogen fusion.

• noonday sun
• volume book on such things
• such measurements
• coal
• hour
• century
• sun
• energy
• matter