93 Billion Light Years
Time and space. They go together like peanut butter and chocolate. And if your mind is still boggled or at least semi-boggled by last night’s brainfuck then, Cousins, you’re in for another treat.
I was watching something once, a sci-fi movie or TV show I think, where a character was referred to as being 500 light years old. Or something like that. Right away we know that we’re dealing with a half-assed writer who needed to do a bit more research because, as anybody who ever took fourth grade science knows, a light year is not a measure of time but a measure of distance. And like eternity, it’s one more thing that our tiny brains cannot fully comprehend.
We all know the definition: a light year is the distance traveled by light over the course of a year. Quick, what did I leave out? That’s right: “in a vacuum.” Very good—give yourself a Reese’s Peanut Butter Cup. So OK, we can define a light year, but can we really even begin to comprehend what it means?
Yipee, you just got some unexpected time off from your job. No you didn’t win the lottery, you were fired. Good, because you were getting sick of that place anyway. And what better way to celebrate your new-found freedom than with a road trip? But this isn’t just any road trip—you’ve decided that you are going to drive non-stop at 100 miles an hour for an entire year. (No, I don’t know what you’re going to do for fuel. Maybe after you got your loser ass fired you purchased a car designed to run the on that stench of failure emanating from your body.)
So if you drive 100 miles an hour for a year you have to admit that you’ll rack up a good number of miles. In fact you’ll end up traveling about 876,000 miles. Why, you could have driven to the Moon and back…twice! Good for you!
OK, now imagine that you’re driving that car not 100 miles an hour, but at the speed of light. Which is what? C’mon, fourth-graders. Right, 186,000 miles per second. Not per hour, mind you, but per second. You click on a flashlight and count to one and that beam of light is already 186,000 miles away.
And for those keeping score at home, that works out to about 669,600,000 miles per hour. (Assuming no traffic.) So if at the speed of light you can travel that far in a second how many miles will you travel over the course of a year? This many: 5,878,625,373,183.
There are really two definitions of the Universe. One is everything that’s out there. And how much is that? As I mentioned last night, we don’t have a clue. Is the Universe finite or infinite? There may be some form of cosmic being somewhere that knows the answer to this, but guess what, Mortimer? It ain’t you.
The second definition of the Universe is a little easier for our monkey-type brains to handle. It’s conveniently defined as what we can observe; the known Universe. And this, of course, is the most fluid of definitions. We are extending our view into space more each year, and the further we see the larger our known Universe becomes.
The nearest known star to us (yes, yes, other than the Sun—god, you’re anal) is Proxima Centuri. It is a little over four light years away. In other words if you shine a flashlight at it right now that light won’t reach it until almost three years into John Edwards’ first term. And yes, that’s at 5,878,625,373,183 miles per hour.
And now back to the Universe, the known Universe. If you eat your Wheaties and jog on out to the edge of the known Universe and shine a flashlight across to its other side, it will take that beam of light 93,000,000,000 years to get to the other side!
Whew, these numbers are about to make my head explode. I better quit here and rest my brain for a while. After all, I have to drive all the way to San Leandro tomorrow.


