BigBang

Today, the consensus among scientists, astronomers and cosmologists is that the Universe as we know it was created in a massive explosion that not only created the majority of matter, but the physical laws that govern our ever-expanding cosmos. This is known as The Big Bang Theory.

The Big Bang hypothesis states that all of the current and past matter in the Universe came into existence at the same time, roughly 13.8 billion years ago. At this time, all matter was compacted into a very small ball with infinite density and intense heat called a Singularity. Suddenly, the Singularity began expanding, and the universe as we know it began.

This is not the only modern theory of how the Universe came into being – for example, there is the Steady State Theory or the Oscillating Universe Theory – but it is the most widely accepted and popular. Not only does the model explain the origin of all known matter, the laws of physics, and the large scale structure of the Universe, it also accounts for the expansion of the Universe and a broad range of other phenomena.

-adapted from https://www.universetoday.com/54756/what-is-the-big-bang-theory/

The Solar System is 4,571,000,000 years old

or 4.5 billion years old

Some of the milky way is 13,400,000,000 years old, the newest bits are only 800,000,000 years old

Keyword List

consensus

astronomers

cosmologists

Singularity

hypothesis

Further Learning, Want to know more try these questions from Cambridge University

Very advanced

https://isaacphysics.org/gameboards#phys19_l7