**Ask a monkey a physics question thread**

[Savy]

For the same reason, the concept of a "light year" seems flawed.

How can a light year be a particular value, when two people will have a very slightly different idea of exactly how long a year is?

Because these things are defined. Being unaware of a definition doesn't make it not exist.

I also have some issues with the age of the universe.

I mean we're told it's 14 billion years or whatever.

I have to ask...

In whose frame of reference?

What do you think?