Fast Radio Bursts (FRBs) have led to many discussions about whether or not we might be on the verge of finding evidence for an advanced civilisation in a far away galaxy—as scientists still couldn’t discover where exactly the FRBs came from, the theory was risen that the bursts might have been emitted by a neutron star; or, that they actually could have been caused by some sort of humongous radio transmitter that was artificially created to power an alien spacecraft (https://www.cfa.harvard.edu/news/2017-09?utm_content=bufferc5af4&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer). Which is, I’ll admit, quite the cooler theory. But let’s look at what scientists say.
As we discover more and more exoplanets, some of them even in Goldilocks’ zone—meaning that their distance to their home star is such that they could bear liquid water and even support life, you know, like, not too warm but not too cold, either—, more people start to think that we should als discover alien civilisations on some of those exoplanets. OK, it might seem more realistic that we’d find bacteria on an exoplanet instead of an ancient, advanced civilisation building humongous sailing spaceships, but let’s say it could be aliens; we’d have to examine a few things.
Where is the source of the FRBs?
That’s the problem; scientists were not able to find the source of the weird signal yet, even though we know that the bursts came from a far away dwarf galaxy. Which leads us to the next problem: What or who ever might have caused the signal; scientists stated that the signal could have travelled for about 3 billion years (https://www.cnet.com/news/frb-121102-fast-radio-bursts-aliens-seti-meti-galaxy/). That means, if it were aliens, then we would see them flying through their galaxy 3 billion years ago. In the meantime—unless their spacecraft is really, really slow—they would have likely moved on to a different part of the universe.
Why would aliens use that sort of power?
The idea of powering your spacecraft with radio emission isn’t so bad, but it might not be as easy as it sounds. First, you’d need a transmitter big enough to power your probably huge (and heavy) spacecraft even if you’re far away from the transmitter. That would suggest that you’d have to build a gigantic transmitter; some scientists even suggest it would have to be about the size of the earth. I mean, this might be less harmful to your planet’s environment than using fossil fuel, but then you would need just a lot of energy. I’d suggest that such a device might be built by a civilisation that doesn’t have a home planet any longer, so they have to build a transmitter in space. Maybe they built a transmitter to find a new home planet. To build such a device would mean that the aliens that built it are very, very advanced, way more advanced than our civilisation.
But what if the aliens actually tried to contact us?
Could the signal have been sent by an alien civilisation to contact us? OK, it could be really the attempt of an advanced alien civilisation to contact our planet. But why should they contact us using FRBs? Wouldn’t there be a way that wouldn’t need that much energy and would be easier to be decrypted? It is more likely that the signal actually was caused by a gigantic alien spaceship, or that the aliens didn’t mean to contact us; however, we will have to find out where the signal came from before we can determine whether or not it was aliens. But we should mind that it might also be a neutron star—or, who knows, maybe an astronomic object we still have to find out about.