title: History of the Big Bang theory
context: In his 1225 treatise De Luce (On Light), English theologian Robert Grosseteste explored the nature of matter and the cosmos. He described the birth of the universe in an explosion and the crystallization of matter to form stars and planets in a set of nested spheres around Earth. De Luce is the first attempt to describe the heavens and Earth using a single set of physical laws.[3]
question: When was the Big Bang theory first introduced?
answers.text: 1225