It seems to be commonly accepted that the Big Bang occurred roughly 13.7 billion years ago. My question is what is the meaning of the year in this context?
When I type year definition into google, it returns this:
The age of the earth likewise is accepted 4.54 billion years. I'm assuming that by years old, we mean Earth years.
Now, if the earth only existed for 4.54 billion years
- What is the meaning of the year before the Earth existed?
- Why is the age of the universe even expressed in years as opposed to something like distance?
It appears that 13.7 billion (Earth) years is completely meaningless since a year depends on the existence of the Earth.