GENERAL KNOWLEDGE

Detailed explanation-1: -Around 13.7 billion years ago, everything in the entire universe was condensed in an infinitesimally small singularity, a point of infinite denseness and heat. Suddenly, an explosive expansion began, ballooning our universe outwards faster than the speed of light.

Detailed explanation-2: -The Big Bang theory says that the universe came into being from a single, unimaginably hot and dense point (aka, a singularity) more than 13 billion years ago. It didn’t occur in an already existing space. Rather, it initiated the expansion-and cooling-of space itself.

Detailed explanation-3: -Based on measurements of the expansion using Type Ia supernovae and measurements of temperature fluctuations in the cosmic microwave background, the time that has passed since that event-known as the “age of the universe"-is 13.8 billion years.

Detailed explanation-4: -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%.