GENERAL KNOWLEDGE

Detailed explanation-1: -Our universe was born about 13.7 billion years ago in a massive expansion that blew space up like a gigantic balloon. That, in a nutshell, is the Big Bang theory, which virtually all cosmologists and theoretical physicists endorse. The evidence supporting the idea is extensive and convincing.

Detailed explanation-2: -By measuring how the Universe expands over time, we can come to know what forms of matter and energy are present within it. Scientists confidently state that it has been 13.8 billion years since the Big Bang, with an uncertainty of less than 1%.

Detailed explanation-3: -About 13.8 billion years ago, the Big Bang gave rise to everything, everywhere, and everywhen-the entire known Universe.