The first part of you question is answered here:MightyMeanie said:What is the distance to the nearest star? Is the nearst star Proxima Centauri (and it being 4.3 lightyearsaway)? Whats the Distance across a galaxy and the size of te observable Universe?
This is wrong. In the current cosmological model the edge of the observable universe would be located at about 46 billion lightyears.The present distance (comoving distance) to the edge of the observable universe is larger, since the universe has been expanding; it is estimated to be about 78 billion light years