The 14 galaxies at the edge of the observable universe may have already collided. Given that the diameter of the observable universe is 93 billion light years, the light from those galaxies has taken about 46.5 billion years to reach us.
It always amazes me that we can look so far into the past by simply looking up. And that a few photons traveled unimaginable distances over billions or trillions of years, just to hit my retina.
|