So scientists have discovered what might be the first ever exomoon, a moon around a planet in another solar system, and that’s exciting because within our own solar system moons have become the place to look for life outside of this planet. Specifically Europa and Enceladus may be homes for extraterrestrial life; worlds with big sloshy oceans and hot cores hidden under a thick layer of ice, which means that if there’s life there it may never have seen the stars. It may not have any awareness of life beyond its own world. And if you know your Douglas Adams you know what that could mean for life, the universe, and everything.
The reason they why they had never thought to themselves “We are alone in the Universe,” was that until one night, they didn’t know about the Universe.
Imagine never even thinking, “We are alone,” simply because it has never occurred to you that there’s any other way to be….
They flew out of the cloud.
They saw the staggering jewels of the night in their infinite dust and their minds sang with fear.
For a while they flew on, motionless against the starry sweep of the Galaxy, itself motionless against the infinite sweep of the Universe. And then they turned round.
“It’ll have to go,” the men of Krikkit said, as they headed back for home.
Or it might not be so bad. With the discovery of every new exoplanet, or even considering the possibility of life beyond our little blue sphere, my first thought is always, how do we get there? Because even if you barely know anything about astronomy you know that the universe is really big and that means there’s a lot of, well, space, between us and even our closest neighbors. Consider this: it takes eight minutes for sunlight to reach us and if you’ve ever looked at the sun you know how close it is. Also you should never look at the sun. It takes thirteen minutes for that same sunlight to reach Mars, and it takes a really long time for any sunlight to hit Uranus, but that’s another story.
It takes more than four years for that same sunlight to reach our nearest stellar neighbor, and that’s how big space is. Getting there seems like an insurmountable challenge, but we’ve been exploring the local solar system for less than a century. And as for the question, where are the aliens? we’ve barely begun to even look. Even if they use the same radio frequencies we do their transmissions are going to be limited by the same speed and distances as ours. Space exploration has already spanned generations and will have to take several more–it took Voyager 1 thirty-five years just to leave the solar system, traveling at about 38,000 miles per hour, and even if it doesn’t get pulled over for speeding it’s going to be a really long time before it reaches another solar system.
If we’re going to survive as a species–and I realize that’s a big if–the real challenge isn’t going to be living on this planet but what’s beyond it, which is why what’s out there, where the whole process of life started, where it must be continually starting in so many places, is the key to our very existence. And what’s out there isn’t going anywhere, so the question is, where are we going?