Why when they talk of the Big Bang , no one talks about that if every minute the universe is expanding to where stars and galaxies are moving out of our site . My question has always been how do we know how much of has moved to the point where we can’t see or have ever seen ? <br>And if we don’t know how much has traveled out of and for how long then how could we know how old the universe is . <br>We only been looking to the stars for the last 100 years or so and we can never know how many galaxies have moved outside the the point of no return