A brief history of the universe
What exactly is spacetime?
WELL, it’s pretty difficult to understand even for brainy folk who are really good at hard sums, but put simply spacetime is a mathematical model that joins space and time into a single idea called a “continuum”.
Combining the idea of space and time helped physicists understand how the universe works on both the big level, such as galaxies, and small level, such as atoms. The laws of physics now state that time cannot be separated from the three dimensions of space.