Something must have started all of the galaxies moving away from each other, maybe the 'big bang'.
All the matter and energy must have been compressed into a very small space that exploded and started expanding.
This expansion is still going on.
The big bang may have happened about 14 billion years ago. Though this isn't very accurate.
The Steady State theory:
This is the belief that the Universe has always existed and it will always be here.
It explains the expansion by suggesting matter is being created in the spaces as the Universe expands.
Comments
No comments have yet been made