simsqu wrote:AsleepInYorkshire wrote: I think distance isn't the only barrier.
And also another absolutely useless fact ... I think it's Beetlejuice (Betelgeuse) that the men in white are watching as they think it's on the cusp of blowing up? It being on the YouTube video link.
Yes good point time is very important. There is a lot of space and time and relatively few chances for species to meet.
Hah! I When I first (mis)read that I thought it was a nice joke. But not sure it was intended.
When it comes to the universe at large, space and time come to much the same thing, one way or another.