(February 20, 2012 at 5:02 am)chipan Wrote: From that logic, I conclude the astronomers are ignorant in saying that the universe is 14 billion years old. How do they come up with that number? It can't be because the observable universe is 45 billion lightyears away from us.
They don't say 14 billion. Some may round it off to 14 billion but most don't. The age of the universe to 4 significant figures is known to be 13.72 billion years. The value calculated from the Hubble constant (which isn't exactly constant) is 20 billion years. Since that value was first calculated there have been many advances that refined the value to 13.72. I suggest you get your mommy to get a good book on the age of the universe and read it to you.