3I/ATLAS: It’s Not Aliens

Hello, friends!

You know the expression “If it looks like a duck, swims like a duck, and quacks like a duck, it’s probably just a duck”?  Well, to a certain kind of person, if it looks like a duck and swims like a duck and quacks like a duck, then it must be an extraterrestrial life form that the government has disguised as a duck.  Right now, there’s an interstellar object passing through our Solar System.  It looks like a comet.  It moves like a comet.   It’s grown a tail like a comet.  I think you know where I’m going with this.

Astronomers have named this object 3I/ATLAS.  The “3I” part of the name means this is the 3rd interstellar object we’ve spotted inside our Solar System (the previous two were 1I/Oumuamua and 2I/Borisov).  The “ATLAS” part means this object was first detected by the Asteroid Terrestrial-impact Last Alert System (ATLAS for short).  Ever since the discovery of 3I/ATLAS, there’s been a lot of speculation online, in the news, and even in some corners of the scientific community about how this object might/must be an alien spaceship or alien space probe—or even an alien space weapon!  But this is coming from the same people who cry aliens whenever anything even remotely interesting happens in outer space.

As someone who loves space, I find all this “BuT WhaT iF iT’s ALieNs?” talk annoying and disheartening, because 3I/ATLAS doesn’t need to be aliens in order for it to be interesting.  For example, did you know 3I/ATLAS is insanely old?  By most estimates, it’s approximately 7 billion years old, which makes it 50% older than our entire Solar System.  3I/ATLAS also seems to be composed of unusually high quantities of frozen carbon dioxide (and correspondingly low quantities of frozen H₂O).  I’ve read several different possible explanations for this, but the one I find most intriguing is that 3I/ATLAS may come from a star system where water is extremely scarce.

When we learn new things about outer space, ironically, we often end up learning even more about the Earth.  I’ve said before on this blog that our ability to compare and contrast Earth with other planets in the Solar System has taught us a great deal about our home planet.  Now our science has advanced to a point where we can identify interstellar objects as they pass through our Solar System.  We can observe them and study them and use that information to start comparing and contrasting our Solar System with whatever star systems these objects originally came from.  I don’t know what we’ll learn by doing that, but I know we’re going to learn something, and I love that for us!

As for the aliens… someday, I believe we will discover alien life, and that day will be awesome!  If 3I/ATLAS really were an alien spacecraft, that would be awesome, too, but that hypothesis is based more on wishful thinking than actual evidence.  I, for one, think the actual evidence about comet 3I/ATLAS tells a far more interesting story than all the wishful thinking in the world ever could.  How about you?

WANT TO LEARN MORE?

There’s a lot of confusing and conflicting information out there right now about 3I/ATLAS, even without the people crying “it’s aliens!”  That’s because 3I/ATLAS is still under heavy observation at the moment, and new data is coming in at a rapid pace.  That being said, I’m going to recommend these two articles, which I feel give a pretty good synopsis of how much we know so far and how much more we’re hoping to learn.

• The Race to Study an Interstellar Comet from Deep Space, from Scientific American (warning: possible paywall).
• SPHEREx and JWST reveal what Comet 3I/ATLAS is… and isn’t, from Big Think.

I also want to recommend this video from Hank Green, titled “Why it’s Never Aliens,” for a more detailed analysis of why, whenever people cry aliens, it never turns out to be aliens.