What do astronomers mean by the Big Bang?
A)the event that marked the beginning of the expansion of the universe
B)a gigantic explosion that blew all the galaxies in the universe to smithereens
C)the explosion of a massive star at the end of its life
D)the event that marked the birth of our solar system

Question

Quizplus · Accepted Answer

Astronomers use the term Big Bang to refer to the event that marked the beginning of the expansion of the universe. It is the moment when the universe started to expand from a very high-density and hot state, approximately 13.8 billion years ago. It is not an explosion in the traditional sense, but rather a rapid expansion of the universe from an incredibly dense and energetic state.

What Do Astronomers Mean by the Big Bang