The topic of aliens visiting Earth never seems to go away does it?
We have heard previously how aliens could have already visited Earth - but we might have missed them completely.
But you would think that one might be curious enough to visit our little blue planet?
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Unfortunately, it seems that a group of NASA scientists have theorised why aliens haven't come to visit us yet.
The reasoning behind this you ask?
Well, intelligent societies tend to wipe themselves out, and a report theorised that to be the reason we haven't seen any little green men knocking about.
According to the report, titled 'Avoiding The Great Filter: Extra-terrestrial Life And Humanity's Future In The Universe' which came out in 2022, an 'existential disaster' lies in wait as 'our society advances exponentially towards space exploration'.
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"The Great Filter has the potential to eradicate life as we know it, especially as our rate of progress correlates directly to the severity of our fall." it continues to say.
"This indicates a necessary period of introspection, followed by appropriate refinements to properly approach our predicament, and addressing the challenges and methods in which we may be able to mitigate risk to mankind and the nearly nine million other species on Earth."
The report also touched on aliens and their reasoning as to why we haven't seen any yet.
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It said: "In the perspective of global behaviour, the discovery of a planet-rich Universe has rendered less a question of whether aliens exist, but rather in the occurrence that they (statistically, at least) likely do, and are we in a sufficiently stable position to receive such news.
"But when it comes to foundational questions, the former does present interesting inquiry.
"If extraterrestrial intelligence does exist, humanity must self-improve on nearly all accounts to meet and even surpass such others."
The report also added: "On the flip side, if intelligent life does not appear and perhaps never was, we have some other more philosophical difficulties to juggle – but no less daunting.
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"Our lives are not expendable. We have been treating casualties as casual, nukes as necessary, and large-scale death as inevitable events.
"Life - human life, the lives of our delicate biomes and the millions of species which inhabit it - is unique and so incalculably precious.
"Carelessness leading to failure is not an option.
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"We are the only ones who can help ourselves; there should be no expectation of mentors or saviours to step down from the sky on our behalf."
Callum Jones