Billions of stars, billions of planets, an inestimable number of moons and asteroids…
there are plenty of places in the universe that could be home to alien life.
Not to mention the endless expanse of a near-perfect vacuum
between all of those celestial objects that an alien spaceship could be travelling through.
So, this is Unveiled, and today we’re discussing four possible solutions to the Fermi Paradox.
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For more than seventy years, the Fermi Paradox has been a key talking point among space enthusiasts,
as well as alien hunters. Modern legend has it that in 1950, the physicist Enrico Fermi
met with colleagues during lunch break at Los Alamos National Laboratory in the United States.
They were discussing the big topics of the day, when Fermi is said to have suddenly exclaimed,
where is everybody? (or words to that effect). His precise phrasing is still up for debate,
but the general meaning isn’t. Fermi was asking about extraterrestrial life… and wondering why,
despite all of the predictions that aliens were probable, we still hadn’t discovered any.
Fast forward to today and while science, astronomy and space travel has come on leaps and bounds in
many other ways, the Fermi Paradox holds true. We still haven’t discovered alien life, despite there
being now more predictions than ever that it must exist somewhere. So, in this video, we’re pitching
four possible answers to this most famous of problems. Four solutions to the Fermi Paradox.
The first actually contradicts most of what we just said. It’s that space is just too darn big!
And that life is, potentially, too darn rare! Yes, we increasingly believe that life beyond Earth
must be possible, but we’ve also increasingly come to appreciate that the universe is massive. When
we talk about alien life, we often imagine that it’s only just beyond our reach. That,
if we pointed our telescopes in just a slightly different direction, we’d find it. And it’s
therefore only a matter of time - and of telescope tweaking - before we can say with certainty,
“yes, aliens exist”. But, in reality, we humans wield nowhere near as much control or influence.
We’ve been hard at space travel and research for around a century now, but it’s only relatively
recently that the first man-made objects left even our star system - the Voyager probes. And,
even then, neither Voyager has unshackled itself of the sun’s gravitational pull,
and neither will until they pass beyond the Oort Cloud - a feat that, if it happens, won’t
happen for another thirty thousand years or so! We have cast our net further via electromagnetic
and radio signals… but even where these are concerned, we’re only beaming out in earnest to
an area around one hundred lightyears from Earth. That’s in a galaxy that’s more than one hundred
thousand lightyears across. And in a universe that stretches for ninety-three billion lightyears,
at least. Clearly, we’re not exactly a commanding presence in space at the moment.
And it’ll be a long time until we are. So, it’s easy to see how we could be easily missed.
Now add into the equation various theories that life could be uncommon, most notably the Rare
Earth Hypothesis, and what are the chances that aliens will ever be in communicable distance?
The Rare Earth Hypothesis regularly comes under fire, but advocates suggest that it’s not only
the conditions for life that could be unusual, but also the emergence of life even when those
conditions are met. It therefore matters little to Rare Earth theorists how many stars and planets
are estimated to be in the sky… because very few of those will amount to life, and even fewer will
be anywhere near us. Paradox solved… maybe! Our second option, the Planetarium Hypothesis,
offers a totally different take on the problem. It says that aliens do exist and that they are
reasonably close, but that we’ll never know anything about them - and that’s just the way
they like it! This theory is partly built on the Zoo Hypothesis, a much-debated idea that Earth is
like an enclosure in some kind of higher-level zoo… and that life on Earth is being watched as
if caged, by some kind of higher-level being. The Planetarium Hypothesis takes it a little further,
though, and directly answers why we’re apparently so unaware of our alien overlords.
First put forward by the science fiction writer Stephen Baxter in 2001,
it loosely proposes that space - or what we understand to be space - is a lie. Instead,
it’s a virtual reality sim, purposefully rendered so that whenever we look out into the universe,
we see no signs of life… because that’s how the higher powers want it to remain. In this instance,
the sky is like a planetarium. It’s a wholly artificial thing. Of all the solutions to
the Fermi Paradox, this one is perhaps one of the least supported in the wider scientific community.
But it does set up an interesting, alternate take on the matter… where alien life is
in complete control, and humans might never break free, let alone solve any paradoxes!
Our third possible solution, the Dark Forest Theory, also imagines that aliens do exist
and that they could be close. But, this time, they’re not in total control.
In the Dark Forest Theory, alien civilizations don’t reveal themselves to us (or to anyone else,
for that matter) because they’re extremely wary. Alien life moves slowly through the universe,
with the primary goal being not to attract the attention of anything else that could kill it off.
And when it comes to taking over galaxies, they’re just not that interested.
Dark Forest aliens are careful rather than cavalier… and guarded rather than gun-slinging.
It’s an idea first put forward again by a sci-fi writer, this time Liu Cixin
in his “Three-Body Problem” book series. Here, the Fermi paradox is answered because it leaves
us with the feeling that aliens actually could be all around us… it’s just that for as long as
they perceive humankind as a potential threat, then they’re never likely to approach. For some,
we ourselves should be applying a similar policy to our own efforts toward space exploration.
Missions like the Voyager probes and the beaming out of radio signals may be pioneering,
but they’ve always been met by some with a degree of trepidation. The question usually asked is;
is it safe to make ourselves known? Finally, though, what if none of the
above really matters at all? What if alien life isn’t uncommon as per the Rare Earth Hypothesis,
it isn’t all-powerful-from-a-distance as with the Planetarium Hypothesis,
and it isn’t common-but-careful as per the Dark Forest Theory? What if
it’s already here, right in front of our eyes? Conspiracy theories abound claiming that aliens
are among us… whether it’s a shapeshifting, reptilian race sent here to destroy us,
or a united front that’s hijacked our governments to assume total control on the ground.
We’re not so interested in those ideas, today… but it still stands that one potential solution to the
Fermi Paradox is that aliens are actually all around us, it’s just that we can’t sense them.
In early 2020, the British astronaut Helen Sharman made headlines for the seemingly
sensational claim that aliens could be “here right now and we simply can’t see them”. Speaking to The
Guardian newspaper, Sharman also referred to the possibility that aliens could have a
totally different biological makeup to us - where carbon and nitrogen aren’t as essential to their
existence. In writing about Sharman’s comments, the astrobiologist Samantha Rolfe has gone further
still, suggesting that, if such life did exist, then a shadow biosphere could also exist to
house it. And so, when Enrico Fermi asked back in 1950, ‘where is everybody?”, he may have actually,
unknowingly been in close proximity to aliens at the time. Or, so the theory goes, anyway!
In truth, these aren’t the only possible solutions to the Fermi Paradox. There are
plenty more, and some more outlandish than others! But these ideas do broadly stretch
across four possible big-picture-scenarios: 1) There aren’t any aliens, or at least none that
are close by, and that’s why we haven’t found any. 2) There are certainly aliens, but they totally
control us, and that’s why we don’t know about them.
3) There are certainly aliens, but they’re totally scared of us, and that’s why they’re so quiet.
And 4) There are aliens all over the place, it’s just that they’re invisible to us!
Which is your favourite theory? Or do you have a better answer to this great, cosmic conundrum?
For now, those are four possible solutions to the Fermi Paradox!
What do you think? Is there anything we missed? Let us know in the comments, check out these other
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