i understand much of the theory behnd the big bang, and why 13.7 billion years is calculated, but the problem i was recently thinking about, is what they mean by a billion, the USA defines a billion as 1000 million, whereas much of the world defines it a billion as a million x million in the same way a million is 1000x1000,
Stephen hawking's book i have seem's to indicate its 13.7 international billion years old, which would be 13700 US billion years old, i was wondering if anyone knew for sure.