The universe is expanding, with every galaxy beyond the Local Group speeding away from us. Today, most of the universe’s galaxies are already receding faster than the speed of light. All galaxies currently beyond 18 billion light-years are forever unreachable by us, no matter how much time passes.

 

Our universe is full of stars and galaxies everywhere and in all directions. From our vantage point, we observe up to 46.1 billion light years away. Our visible universe contains an estimated ~ 2 trillion galaxies. However, most of them are already permanently unavailable for us.

Read the full article at: blog.thespaceacademy.org