Early attempts to explain the origin of this system include the nebular hypothesis of the German philosopher Immanuel Kant and the French astronomer and mathematician Pierre Simon de Laplace,...
Either works, given the often-contrary nature of the English usage of H. However, I've heard "a hypothesis" more than "an hypothesis". Improved Answered: In instances where words that begin with "h"...
It was first proposed in 1734 by Emanuel Swedenborg. Originally applied only to our own Solar System, this method of planetary system formation is now thought to be at work throughout the universe....
if your not religious, comets brought ice, the ice melted and then with other compounds, elements, and heat life came to be or maybe from deep ocean vents where there isn't light but there is heat...