97% of the observable universe is forever unreachable

The other day, I was reading a post by Ethan Siegel on his excellent blog, Starts With a Bang, about whether it makes sense to consider the universe to be a giant brain. ¬†(The short answer is no, but read his post for the details.) ¬†Something he mentioned in the post caught my attention. But … Continue reading 97% of the observable universe is forever unreachable