Light from other galaxies
Won’t have time
to reach our own.
In a few billion years,
Look up! We seem alone.
A short poem this week – and late! But I’ve been working a fire with my volunteer fire department, and my dog is sick, so I have excuses. I have had time to think about cosmology.
It’s hard to wrap my head around, but the universe is expanding and accelerating. So the speed of light stays constant, but distances grow. Eventually, other galaxies will be moving away from us so fast that their light can’t reach our own. Of course, human beings won’t exist by then, and even our solar system may be gone.
If there were people in that distant future, what would they think of the universe? A Steady State model would explain what they’ll see, so they might never know there was a Big Bang. Perhaps the same thing has happened to us. The early universe may have been different in ways we can’t imagine. We may be missing the full truth, just like our hypothetical future brethren will.