‘Oumuamua and her Anomalous Acceleration

ESO/M. KornmesserDerivative: nagualdesign 

You may have seen the news recently.  The headlines have been pretty fierce:  “Scientists say mysterious ‘Oumuamua’ object could be an alien spacecraft” And of course, very predictably, people have been going kind of crazy over these findings.  What’s interesting to me is that people seem to be pretty cleanly divided into two camps.   There are the people who see such a headline and immediately seem to think “that’s it then, it is aliens.”  And then there are the people who exist purely to counter them.  “There is no way it is aliens, this is rubbish.” 

What honestly astounds me is just how little thought seems to be put into the analysis of such subjects by the average person.  Scratch that, not the “average person”; even highly intelligent people appear to be drawn in.

Almost more predictably than the hysteria around the study which indicated that it is possible for ‘Oumuamua to have been alien; there have been a rash of articles attempting to play the “holier than thou” angle.  For example “No, ‘Oumuamua Is Probably Not an Alien Spaceship” In which the author points out that “it’s not an alien spaceship, because its trajectory doesn’t look like the kind that thrusters would produce.”

Wow, riveting stuff Gizmodo I guess when we see a pigeon walking on the ground we can safely conclude that it is not a bird; given that walking “doesn’t look like the motion that wings produce.”  Very conclusive evidence. 

And that’s it.  That’s all the evidence that is ever presented in this article to conclude that this is not in fact an “Alien spaceship.”

“Nobody is saying it is a spaceship”

Actually, let’s talk about that really fast.  Nobody is saying it is a spaceship.  The study by Bialy and Loeb Investigated the possibility that solar radiation pressure (the minute force of the sun’s rays pushing on an object) could be an explanation for the anomalous thrust detected by astronomers.  (That the object accelerated as it flew away from the sun.)

It seems that most of the critical appraisals of the subject aren’t actually of the subject at all.  Bialy and Loeb never said it was aliens.  It’s media commentators that are running wild with the note at the end of the study that this object may in fact be artificial in origin.  Now, did Bialy and Loeb likely expect such a reaction, almost certainly.  But that’s the nature of the beast.  And if the hyperbolic nature of the news media can bring more attention to science, and especially to space, I say full steam ahead!

But to say that the study is somehow refuted because “they said it was aliens and they can’t know” is a scarecrow, and is fallacious.   That’s not what was said at all.  We currently do not know what caused the object to speed up.  But it’s more than that.  Rocks don’t just magically speed up on their own.  I hate to break it to you, but that’s not how rocks work. 

What can happen, is something called “out-gassing.”  When a comet gets close to the sun, and starts to heat up, some of the ice it is composed of will melt and shoot off as a gas, pushing the comet and leaving a distinct trail in it’s wake. 

We didn’t find that with ‘Oumuamua.  In fact, a recent paper suggests strongly (via a mathematical model) that it would not be possible for this object to be a comet propelled by out-gassing.  The solution proposed by Bialy and Loeb, that the object is potentially being pushed by the sun, is more likely based on a preponderance of the evidence.

So here’s the deal.


Is it Aliens?

Obviously, nobody knows.  But there’s a lot of things we don’t know about this object.  For starters, we don’t even know what shape it is, or how big it is.  You may have heard people talk about how it is “cigar shaped”.  Well we can’t say that for certain.  That is a theory that was drafted in response to observations of ‘Oumuamua.  Most specifically the magnitude of light the object reflected back at our telescopes on the ground.  

When we observed this object.  We didn’t get a nice clear picture of it.  The object was 1 (one) pixel wide from our vantage.  Astronomers took a look at the brightness of the object over time, and from that data inferred a best guess for its size, shape and radial movement (they think it’s tumbling in 3-Dimensions)

The point I’m getting at here is that: nobody knows what is going on with this thing.  To say that is “is” aliens is just entirely baseless.  But here’s what I hear most of the critical appraisals saying: “You need to stop talking about aliens because just because we can’t prove it isn’t aliens doesn’t mean it is.”  That’s partially true, but off the point. 

You see, the point here is that we don’t really know anything about this thing.  We are making inferences based on slivers of evidence, and attempting to determine what is most likely true. 

We don’t know that ‘Oumuamua is cigar shaped.  That’s just the current best guess we have to work with.  There is in fact a competing theory that the object is more shaped “like a pancake.”  If we you’re gonna pen a self-righteous jab at attempts to challenge the current body of knowledge in the world; perhaps you should focus just as much attention this topic.

It is just as true that we do not know what shape this object is.  As such to say that it is “cigar shaped” is disingenuous.  But you’ll hear no cry from the rafters over that.  It’s “plausible” in the minds of many, and so they see no reason to consider it further.   But mention that it may be artificial, and you will hear the screams of a million armchair astrophysicists exclaiming “I’m smart and it is a rock.”

“Balance of Probabilities Sherlock”

Which guides me to the conclusion of this article.  There is one more wheel to turn, one more peg to be driven into its hole.  There does appear to be an unspoken undercurrent of logic to the acceptance of the claims as to the ‘Oumuamua’s shape, and subsequent exasperation over it’s possibility of being a solar sail.  That is, that we’re very used to looking at the sky, and seeing rocks.  And we’re not used at all, to seeing much else.

This is where the Fermi Paradox comes in.  A brief refresher for the uninitiated.  The Fermi Paradox isn’t really a “paradox” in the traditional sense.  That is, that it doesn’t logically invalidate itself.  What is is, is a collection of observations, that has troubled astronomy for generations.  Specifically “where is everyone?”

Based on all of our understanding of the ways in which the universe works, we should not be alone in the galaxy.  Not even that, but when we turn our heads to the sky, we should be looking at a bustling marketplace, not quiet, desolate, emptiness.

If even a single civilization has advanced to a tech level only a few hundred years ahead of where we are now, they should be able to colonize the entire galaxy, in less than a few million years.  That’s without warpdrives, without teleporters, etc.  (The method for this could be what is known as a Von Neumann Probe.)  And though a few million years may sound like an eternity to you and I, it is a cosmic blink of an eye.

What’s the probability that in a universe filled with innumerable planets around stars massed in galaxies as far as we can see, we are the first? 

And that’s the point.  The Fermi Paradox is so striking, because when we look at the skies; we expect to see other civilizations.  That we don’t see anything, is incredibly weird.  So when people say “it’s incredibly unlikely that its aliens” it’s actually not.

Regardless, whatever this object is, it’s certainly something weird.  Its composition, movement, acceleration, origin, they’re all like nothing we’ve ever seen before.  Maybe it’s just a really special space rock, and maybe it’s not.  Either way, let’s not throw out our best guesses because we want to feel smarter than others.

Accessibility is important — don’t forget image alt attribute
Credit: National Aeronautics and Space Administration

About the author

I do a lot of stuff. I'm a decent hacker. I jump out of airplanes a lot. Done some firefighting and stuff. Philosophy all the time, make music, acting in awesome indie films. Just, a lot of stuff.

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