By Wayne Boyd
In the early days of Hollywood and television, we used to think that life on other planets was common. Science fiction movies about invasions from the planet Mars or Venus were normal. HG Wells wrote War of the Worlds which later became a radio show and still later several big screen adaptations and it was about Martians invading Earth.
Even as our imagination thrived our knowledge of the cosmos grew. We sent probes and rovers throughout the solar system and beyond. We gazed into the stars with our space telescopes. We took images from non-visible light and radio waves. Great minds like Einstein and Hawking churned it over. Finally, after all that, we came to a startling if not disappointing realization: Planets other than Earth that support life, if they exist at all, appear to be the exception rather than the rule. There is no warmongering Martian civilization waiting to invade Earth. There are no lovely ladies lounging around on Venus. It’s true not only for our own solar system, but for all the exoplanets we’ve detected so far.
Our understanding of distances in space developed, especially between stars. Distances, it turned out, were vast. The more we knew the less likely it seemed anyone would go star hopping. That not only applies to us, but the aliens as well, if any extraterrestrial sentient beings exist at all! There will be no warp drives, no faster than light travel, and no light speed travel. It just isn’t possible. We can’t go there and they can’t come here.
Recently, there’s been some reports of UFOs in the news, and that’s always been there from the 1950s on. There is no evidence that unidentified flying objects are extraterrestrial in origin. It is unlikely for the simple reason that to travel from one star to the next would take tens of thousands of years. Sadly, and perhaps fortunately, no one is traveling from star to star. The best we can hope for is that we can visit other planets in our own solar system. Maybe one of them might at least have some microbes.
Once we figured out that there wasn’t much chance of advanced, intelligent life elsewhere within our own solar system, then we hoped we would find it on planets around other stars. Remember the movie Avatar? Supposedly that took place around Alpha Centauri, one of our closest group of stars. So if we can’t find life here then for sure it’s going to be on the closest star!
Yet, as we peered into the solar systems of other stars we came to a new understanding: most planets that we’re able to detect outside of our own solar system are hostile environments. There’s something weird about almost all of them, and so the prospect of finding life orbiting on a planet near our closest star is kind of unlikely. There’s no “Avatar” on Alpha Centauri.
Intelligent alien life is not impossible. The universe is a big place. The point is that we now know it to be rare. So rare, in fact, that it might exist nowhere other than here. At least as far as we can see so far.
In fact, had a giant asteroid not killed off the dinosaurs, homo sapiens might never have evolved. If it weren’t for that chance cataclysmic encounter from space, Earth might even now be ruled by dinosaurs.
Therefore, even if a planet were in an ideal goldilocks region around it’s star, and even if on the off chance single cell organisms had developed there, we have no reason to suspect that a homo-erectus kind of being might have developed there.
We really could be the only ones out there.
