As we evolve as humans, we develop pretty amazing things. As the time moves civilizations advance, as well as technology. Today, we have some incredible tech, extremely powerful and it becomes more advanced every day. Why haven’t we used any of this technology to detect aliens? What is the reason why haven’t we found aliens?
The active Search for Extraterrestrial Intelligence (SETI) has bee ongoing for half a century. To date, no ET signals from stellar systems have ever been detected. Here are popular theories on why our search has come up empty.
Why Haven’t We Found Aliens?
The Rare Earth
Basically, we’re unique. The Rare Earth hypothesis argues that planets with complex life, like Earth, are an extremely rare ad that intelligent extraterrestrial life is highly improbable. Hence, we are one of a kind.
The Gaian Bottleneck
They didn’t survive. The Gaian Bottleneck hypothesis, by astrobiologist Dr. Aditya Chopra, suggests that alien beings are all dead – they simply didn’t make it. Life forms on “habitable” planets failed to emerge quickly enough to stabilize the planet and pave the way for more life.
The Great Filter
Earth was subjected to the Great Filter-five mass extinction events-but nevertheless evolved complex creatures. What if all “habitable” planets were hit with killer asteroids, scorched by solar flares, torn apart by geological upheavals, seared by supernova blasts or gamma-ray burst radiation, and that of all worlds only Earth successfully hurdled the stumbling blocks?
The Great Silence
Alas, we’re not worth it. The Great Silence hypothesis posits that advanced beings who belong to Type 3 civilization on the Kardashev Scale, able to harness the energy output of a whole galaxy, simply do not reach out insignificant carbon-based humans. Why bother with Type 0 bipeds?
Earth had a headstart. In a study, Dr. Peter Behroozi said that compared to all the planets that will ever form in the Universe, the Earth is actually quite early. The last star will burn out 100 trillion years from now and 92% of planets are yet to be born. We are the first but not necessarily last.
Not Life As We Know It
We’ve had it wrong all the time. ETs may not be biological beings like us at all. Noted astronomer Lord Martin Rees said they might be machines, not organic creatures. So we should be looking for solar-harvesting, non-carbon-based structures instead of listening for radio signals.
A Long Road Ahead of Us
Basically, we’ve got a long way to go, and a lot more searching to do. SETI has barely scratched the surface of the radio universe. There are many more wavelengths to scan, so we shouldn’t give up hope yet.
In a Galaxy Far, Far Away
46.5 billion light-years is a distance to the edge of the observable universe (that’s really far!). We’ve scanned for ET signals just around 40,000 light-years from Earth; we haven’t even outpassed the bounds of our galaxy, which is 100,000 light-years wide. Alien intelligence could simply be too far away for our current technology to reach.
These are all the theories of why haven’t we found aliens yet. To learn more about space and universe check out StarkFeed Science.