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Did Ancient Aliens Exterminate the Dinosaurs?

Paleontologist Robert Bakker thinks he knows what really killed the dinosaurs.

Paleontologist Robert Bakker thinks he knows what really killed the dinosaurs.

Did dinosaurs and people coexist?

Proponents of ancient aliens have made many claims in recent years and one of them is that extraterrestrials exterminated the dinosaurs so advanced mammals such as humans could dominate the planet. Is this theory true or just the work of overactive imaginations bent on writing bestselling books and/or producing a hit TV show?

Please keep reading and let’s explore this intriguing possibility:

What killed the Dinosaurs?

Anyone familiar with dinosaurs has probably heard that the impact of an asteroid about 65 million years ago could have brought about the extinction of the dinosaurs. This is known as the Cretaceous-Paleocene extinction event, also known as the K-T extinction, marking the end of the Mesozoic Era, the so-called Age of Dinosaurs.

This asteroid was five to 10 miles across and struck the earth in what is now the Yucatan Peninsula, creating the so-called Chicxulub crater. The blast effects of this cataclysmic event and the resultant debris being flung into the atmosphere, dramatically lowering the temperature of the earth, may have caused the extinction of numerous species, including the dinosaurs, which ruled the earth for about 160 million years.

The asteroid impact is pretty much an established fact, but did it really kill off those terrible lizards?

Interestingly, crocodilians may have survived the extinction because cold-blooded creatures require much less food. Many scientist believe that some if not most dinosaurs were warm-blooded or endothermic. However, mammals are also endothermic and they survived the mass extinction, though their size and niche were much smaller than that of the dinosaurs.

Nevertheless, dinosaurs definitely went extinct at the end of the Cretaceous, give or take thousands of years. Avian dinosaurs such as Archaeopteryx may have survived somewhat longer, which makes sense, because most scientists believe that birds evolved from dinosaurs.

At any rate, the majority of scientists believe a killer asteroid destroyed the dinosaurs – but not all scientists.

Deccan Traps and More Possibilities

About a half million years before the asteroid impact, a period of massive volcanism known as the Deccan Traps greatly increased the amount of greehouse gases spewing into the atmosphere. This warmed the average temperature of the earth about 15 degrees Fahrenheit, essentially cooking the hapless saurians. Then the asteroid impact would have created a kind of nuclear winter, freezing them.

Perhaps not one but two climate-changing events brought about the demise of the dinosaurs.

Another theory postulates that dinosaurs couldn’t digest flowering plants, known as angiosperms, which proliferated during the late Cretaceous period. Dinosaurs preferred conifers or gymnosperms. This inability to adjust to a changing ecosystem could have doomed the dinosaurs. After all, a “failure to adapt” is what dinosaurs are known for!

Still another theory posits that continental drift killed off the dinosarus. Renowned paleontologist Robert Bakker is a proponent of this little known hypothesis. Bakker insists that dinosaurs were indeed warm-blooded and that shifting land masses finished them off. You may recall that the supercontinent known as Pangaea started breaking apart about 200 to 250 million years ago, creating numerous new watery ecosystems. Could dinosaurs have adapted to such changes?

Is this a depiction of an "ancient astronaut"?

Is this a depiction of an "ancient astronaut"?

Are these footprints of a dinosaur and a person?

Are these footprints of a dinosaur and a person?

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How old is this human footprint?

How old is this human footprint?

The Case for Ancient Astronauts Exterminating Dinosaurs

Many people may be familiar with the TV program Ancient Aliens on the History Channel. On the episode titled “Dinosaurs,” proponents of ancient aliens present the theory that extraterrestrials purposely killed off the dinosaurs so people could then flourish. They think these purported ETs used nuclear weapons to snuff out the dinos. Could this be true?

The evidence provided by these ET enthusiasts is that many dinosaur fossils contain the element iridium, which has been found in abundance in the strata created at the time of the K-T extinction. Bear in mind, nuclear bombs contain iridium-192. They also say many dinosaur fossils are radioactive, which is true; in fact, dinosaur fossils are often covered with leaded paint to protect people from radiation.

But did this radioactivity come from the detonation of a nuclear bomb or from the rock in which the dinosaur fossils were found? Many fossils, particularly ones in North America, have been found in or near uranium deposits.

Many scientists think at least some of this radioactivity could have come from a Gamma-ray burst (GRB). For that matter, couldn’t a GRB have wiped out the dinosaurs? And couldn’t these aliens have initiated such a burst? Who’s to say?

Did Dinosaurs and People Coexist?

Many proponents of ancient astronauts support the theory than humans and dinosaurs could have existed at the same time. Perhaps the best evidence to support this theory is that there are places where dinosaur footprints have been found with what appear to be footprints of people. Perhaps the most prominent of such places is Dinosaur Valley State Park in Texas.

These footprints in Texas certainly appear genuine but could erosion have formed them? It’s been proven that erosion has altered some of these footprints. And a fair number of scientists claim that at least some of these alleged human footprints were faked, and this has proven to be the case as well.

Scientists also point out that these human footprints could have been left by dinosaurs with five toes. For example, many dinosaurs actually had five fingers or claws, if you will. Also keep in mind that the fossils for perhaps thousands of dinosaur species have never been discovered. Could the footprints of these unknown species have appeared human-like?

ET advocates also say that the Maya people of ancient Mesoamerica carved the likeness of dinosaur-like creatures in some of their temples, many of which can be found in the Yucatan Peninsula, the scene of the killer asteroid impact.

Moreover, in Ica, Peru thousands of andesite carvings show dinosaurs existing with humans, but these carvings could have been produced in the thirteenth century or even later. And a rock carving at Angkor Wat, a temple complex built about a thousand years ago, shows the likeness of a stegosaurus, a well-known dinosaur species.

But is the existence of artifacts with images of dinosaurs proof of anything?

Wouldn’t Nuclear Bombs Kill Everybody and Everything?

Assuming that humans and dinosaurs were contemporaneous, and that these supposed ancient aliens detonated nuclear bombs to kill the dinosaurs, wouldn’t the resultant fireballs have destroyed all creatures (and people) within the blast zones? This would be like trying to fight a cockroach infestation by burning down the house! Such a question wasn’t answered by the experts on Ancient Aliens. The theory that dinosaurs coexisted with humans is hard enough to believe, but saying that ancient aliens snuffed out the dinosaurs stretches credulity to the limit.


The TV program Ancient Aliens is a very interesting and eye-pleasing production but some of the claims on the show seem far-fetched indeed. Nevertheless, if anyone proves that extraterrestrials exist, the theories presented on this show may become more fact than fantasy.

Please leave a comment.

© 2012 Kelley Marks


TheIntelligentJurassicDeveloper on February 02, 2018:

Not true

Deborah Minter from U.S, California on December 31, 2017:

Interesting theory!

Kelley Marks (author) from Sacramento, California on March 26, 2017:

Hey, Hickory, if nuclear bombs were used to exterminate the dinosaurs, then aliens did it, not humans, and it would have been done many millions of years ago. Later!

Hickory (YouTube)你 on March 25, 2017:

Nice! However I disagree with the Nuclear Bombs theory. In Japan the first nuclear Missle was launched at Nagasaki. This was thousands of years after the dinosaurs. So how could Nuclear Missles destroy the dinosaurs if they weren't developed until thousands of years later? I think that you were misled there. But I think that it is smart that you think about the species survived whatever made the dinosaurs extinct.

Wayra A. Klocker Gregori on November 18, 2016:

We CANNOT be the only living creatures in the universe. Its HUGE!!! And we dont really know that much about it! So why not? Aliens could exist!

bbqwingman on February 16, 2016:

Intelligent dinosaurs do indeed exist and drive triangle ufos. I don't know if they are from another planet or dimension. The craft flies silently unlike our planes. They seemed to talk and even have a sense of humor by laughing. Why they return here is not known. Many people are close minded not believing because they haven't seen....

Kelley Marks (author) from Sacramento, California on November 16, 2015:

Hey, Forest, science is as close to truth as it gets. Inside, as you call it, there are little more than foolish notions and heartburn. The Dinosaurs absolutely did exist. Bye!

Forrest on November 14, 2015:

This moment is the only moment that exists. Dinosaurs never existed as far as I know but we did find thier bones haha. Sometimes it's amazing how the human race thinks we can know things. Maybe those bones where places there by someone to occupy us and distract us from the power of now. We sit and ponder when we could sit and love this moment, embrace the quiet and stop trying to find ancient answers in present day sounds... If there is anything to seek it's the truth that cannot be spoken the truth we all can find inside

Kelley Marks (author) from Sacramento, California on August 08, 2015:

Thanks for the comment, somethgblue. I guess just about anything could have happened regarding the extinction of the dinosaurs, that is, with myth - and science fiction - all things are possible, right? Later!

somethgblue from Shelbyville, Tennessee on August 08, 2015:

Let's consider some of your points and ponder some new ones, shall we . . .

It has long been rumored that Universal Law has abolished nuclear weapons in the Galaxy, so if indeed you were at War with a species and you didn't want any new evolving sub-species to gain a claw-hold on a new planet, towing a large asteroid into that planet's gravity well would certainly do the trick of providing an Extinction Level Event (ELE).

To the casual observer, it would appear to be an accident, no nuclear fallout to contend with and with any kind of advanced warning going underground would help assure survival or getting in a spacecraft and observing the 'Event' from space would also be a safe location.

And perhaps a combination of the two (asteroid and nuclear bomb) were used to help conceal the other. In the movie Jupiter Ascending this very interesting theory is mentioned in passing as proof that Galactic Wars could last millions of years.

Could the rumored underground reptilian bases be the ancestors of an evolving species that was terminated or became a casualty of a Galactic War, it seems more than possible to this writer.

The ancient Sumerian Civilization was name after a reptilian species from the Sirius Star system known as Sumerans and these same Aliens are supposedly the ones that helped Hitler and the Third Reich achieve power by providing cloning technology for super-soldiers and anti-gravity propulsion through the Thule & Vril societies.

So perhaps this 'War' didn't end and reptilians and mammals are still fighting over planet Earth with more strictly enforced rules of engagement.

By the way I linked this fascinating article to one of mine on Full Disclosure, maybe it will bring you a few more page views.

izaiah on April 29, 2015:

how do you have your information? is it all based on theory or is it based on the scientific theory, like finding and researching?

Kelley Marks (author) from Sacramento, California on November 03, 2014:

Thanks for the comment, sjbrenner. I probably wouldn't have conceived the idea for this story without watching the TV show "Ancient Aliens." As preposterous as many of their theories are, it is an entertaining and educational show. Later!

sjbrenner from Minnesota on November 02, 2014:

I find this topic extremely entertaining. I'm very pleased you took the time to discuss something that seems so outlandish, but is it really? Thought provoking and fun I very much enjoyed your hub.

Kelley Marks (author) from Sacramento, California on May 09, 2013:

Thanks for the comment, samowhamo. You're right - there was more oxygen in the air in those days, something like 25 per cent of the atmosphere, compared to 21 per cent nowadays. That's why insects were much bigger too. However, some animals grew bigger during the Ice Age - mammoth and grand sloths, etc - even though the atmospheric oxygen content was essentially the same as now. Later!

samowhamo on May 08, 2013:


The answer to that my friend is that back in those times the oxygen supply was richer than today the more oxygen there is the larger animals will get today there's too much air pollution for animals to grow as large as they did back then.

mystery on May 08, 2013:

another mystery is that,

in dinosaur era every species was huge,

how come today's species that is related genetically to dinosaur era all small now?

something did happen that made them smaller.

scientist should compare dna of dino's (if exist) with human dna

look whether precision and orderliness of dna exist in dino's

like it does in human dna which might mean they have designer dna.

if not dino's were actually of earth origin.

Kelley Marks (author) from Sacramento, California on February 01, 2013:

Thanks for the compliment, samowhamo. It appears we both love dinosaurs. Later!

samowhamo on January 31, 2013:

Hey Kosmo I have an article here you might like (Why I Love Dinosaurs is not the title I changed it).

gascooktop on December 27, 2012:

Great aicle, I also think UFOs have a lot to do with earth history.

Think about it, gas used in gas cooktop is from dinosaur fossils

Kelley Marks (author) from Sacramento, California on November 20, 2012:

Thanks, you guys, for engaging in an online forum about the nature of reality and other weighty concepts, about which we can speculate forever - and have fun doing so. Later!

Insane Mundane from Earth on November 19, 2012:

4D is merely a simple actuality of reality, MM.

Monk E Mind from My Tree House on November 19, 2012:

Er...uh..Kosmo said:

"Yes, indeed the space-time continuum doesn't need to be an OBJECT . Later!"

It not only doesn't need to be, it can't be an object, IM. By combining the three dimensions of reality with the concept of time, we have the concept of space-time. A CONCEPT, IM.

Insane Mundane from Earth on November 19, 2012:

Monkeyminds, we were talking about a space-time continuum, not an object-concept idleness.

Monk E Mind from My Tree House on November 19, 2012:

Indeed, a space-time continuum could NOT be an object, as an object would have a border, that is shape, and space is border-less. If space had a border, what would be on 'the other side' of the border, more space?

Kelley Marks (author) from Sacramento, California on November 18, 2012:

Thanks for stopping by, Insane Mundane. I like your pseudonym, by the way. Yes, indeed the space-time continuum doesn't need to be an object. Later!

Kelley Marks (author) from Sacramento, California on November 18, 2012:

I think we essentially agree, monkeyminds. Theories are not facts, but most theories contain a great deal of facts. Hey! Later!

Insane Mundane from Earth on November 17, 2012:

Oh, dear... Monkeyminds, you are still living in the 18th century. Now you say that the space-time continuum doesn't exist because it isn't an object; ha!

Monk E Mind from My Tree House on November 17, 2012:

^^^Yeah, that's what he'd say. I won't ruin your Hub by going into details that can easily be found on my Hubs. Suffice it to say time and space, energy and wormholes, are concepts...not objects, and never the twain shall meet.

Kelley Marks (author) from Sacramento, California on November 17, 2012:

Actually, astrophysicists, et al., speak of space and time as space-time, because they are two aspects of the same thing, similar to energy and matter, as in E = MC2. Also, various contemporary theories don't eliminate the possibility of worm holes or hyperspace. Ask Stephen Hawking, he'll tell you. Ha! Later!

Monk E Mind from My Tree House on November 17, 2012:

"The only way any civilization will travel from one star system to another is if something like worm-hole aided hyperspace travel becomes possible. Or if a spacecraft could alter space-time as it travels through space, thereby propeling it to super-luminal velocity, now that would do it. Otherwise, it simply won't happen - ever! Later!"

Exactly, and neither of those are possible because there is no such thing as a wormhole or space-time. These are abstract mathemagical concepts with no corollary in reality!

Annemari from Tiny part of the World on November 16, 2012:

Where did you find all this information to share with all of us?

It's very interesting and useful. This would be some useful information for kids.

Amazing hub!

Kelley Marks (author) from Sacramento, California on November 16, 2012:

The only way any civilization will travel from one star system to another is if something like worm-hole aided hyperspace travel becomes possible. Or if a spacecraft could alter space-time as it travels through space, thereby propeling it to super-luminal velocity, now that would do it. Otherwise, it simply won't happen - ever! Later!

Monk E Mind from My Tree House on November 16, 2012:

The key to science is in rational explanations (Scientific Theory).

Of course we have to rule out traveling to the nearest galaxy at 25 million million million miles away. It would take a million years at light speed. AND ... light speed is impossible anyway. It would take an infinite amount of energy to push an infinite amount of mass to the speed of light.

Even at 4 light years away to the nearest star, the human body could not last in space for the length of time it would take to get there. The acceleration needed would tear apart any vehicle using known materials. There is no available propulsion system....etc. etc...

Rationally, man will go the way of the dinosaur or the Neanderthal (mass extinction or background extinction). All species go extinct, even aliens in other star systems.

Even if we can get past the inherent difficulties of space travel, we won't get past that hurdle before we figure out a way to get to the nearest star. The aliens have the same hurdles as we do. Unless some one can rationally explain how THEY can get HERE from THERE.

Brandon Carr from Seymour, CT on November 16, 2012:

Interesting ideas to think about. I'm pretty set on science, but do enjoy keeping an open mind if not just for entertainment purposes. I enjoy the different theories Ancient Aliens presents, and believe people shouldn't be so quick to classify the show as ridiculous. Normally, I've seen them list the facts first, and then allow a "what if" scenario to develop. Education and entertainment in one. What more can you ask for?

Monk E Mind from My Tree House on November 15, 2012:

typo above: shou be intra-galactic

Monk E Mind from My Tree House on November 15, 2012:

The reason there is no evidence is because it's not possible to get here from wherever there is.

It's rational to think that there could be life elsewhere. If it happened once it could happen twice. The problem is inter-galactic travel. The closest star from us is Alpha Centauri at 4 light years.

For the sake of argument we'll assume life there. Intelligent life. How would they get here from there?

Kelley Marks (author) from Sacramento, California on November 15, 2012:

Hey, you guys, there's no evidence that ETs exist or have ever visited the earth or any other planet or celestial body. Pumapunku is a trippy place, no doubt, but nobody's found spaceship parts there, have they? Later!

Monk E Mind from My Tree House on November 15, 2012:

Before anyone can claim so-called evidence of aliens visiting earth, they have to rationally explain how they got here.

Robert on November 15, 2012:

By far the best evidence of advanced technology, possibly ET, is Pumapunku in Bolivia.

jakef on November 03, 2012:

i mean i have watch most of the episodes and read a couple articles and the thing that makes me think the most is that they were rocks that wieghed 130 tons and had to be dragged for 20 miles from a lake. In my opinion rhwew had to of been ancient aliens.

Kelley Marks (author) from Sacramento, California on September 29, 2012:

Hey, monkeyminds, you can click on a link to contact me via email, but these days I can't seem to find it. So, if you want, just send me an email at and I'll be happy to answer any questions you may have. Later!

Monk E Mind from My Tree House on September 27, 2012:

Hi! Kosmo.

Sorry to talk about unrelated topics. I can't find your contact info. Hope you don't mind. Feel free to delete this message and answer by my email, if you'd like.

I understand that YOU don't want folks posting links in your Hub, and that is certainly reasonable for you to expect compliance. But I looked all over HP and the only rule I found about links were in the FAQ. Apparently it is taboo to post in Forums (except two and infrequently). No mention that I can find about Hubs. I don't want to violate any HP rules.

Please refer me to the HP rule against posting links in Hubs. If there is no rule against it, then persons interested in doing so can promote their friends HubPages, and I'd like to take advantage of that. Of course I link to my Hubs within my own Hubs.

When I was in the silk screen business, I sold large silk screened tafata banners roadside. My sales doubled when I put my cousin in business and he set up down the block from me on the other side of the hywy. He got my missed traffic, and I got his missed traffic.

Also, you have averaged 4 Hubs a months. Is it your goal to author one each week? Email me, when you get the time, I have some personal questions.

Kelley Marks (author) from Sacramento, California on September 25, 2012:

Sorry, dude, Hubpages made that rule a long time ago. There's nothing wrong with mentioning your hubs, but please, no hyperlinks included. Cool? Later!

Kelley Marks (author) from Sacramento, California on September 25, 2012:

Thanks very much for your comment, monkeyminds. I really enjoy your enthusiasm for the subject. Doesn't everybody love dinosaurs? Anyway, you shouldn't write a comment that plugs one of your hubs. I'll let you get away with it this time, but next time - pow! Later!

Monk E Mind from My Tree House on September 25, 2012:

I enjoyed your Hub. Of the many theories about dino extinction, yours is the most entertaining!

All species go extinct eventually. This happens by way of background extinction or mass extinction. The dinosaurs probably went extinct due to mass extinction as a result of inversion of the ecological pyramid.

There is a symbiotic relationship between plants, herbivores and carnivores. When the Cycads were replaced by newer plants and eaten by triceratops, Triceraptops starved, in turn T-Rex starved.

If you'd like to explore this you are welcome to stop by my Hub entitled: Dinosaurs, What Happened To Them?

David on August 09, 2012:

Great talk... when i was a kid.. i purposed this dinosaur alien therory to my parents and science teacher..because it does make some sense... and they all said I was nuts.... but no-one really knows the past exactly... we can't even figure out the reason for the Great Pyramids of Egypt, Puma Punku, or who created corn ?

Kelley Marks (author) from Sacramento, California on August 02, 2012:

Thanks for the comment, slcockerham. I'll have to check out Pye's speculations. But it would take a great deal of evidence for me to think that people and the dinos coexisted. Later!

slcockerham from Tallahassee, Florida on August 02, 2012:

Great stuff Kosmo, it seems quite evident that man and dinosaurs existed together. The alien piece is one that needs more examination. Arthor Pye has some interesting speculations on this angle.

Kelley Marks (author) from Sacramento, California on June 17, 2012:

Thanks for the comment, kj force. We certainly could be descendants of aliens. Maybe all of that began with a cometary impact. Hey! Who knows? Later!

kjforce from Florida on June 16, 2012:

Very interesting hub and subject..there are so many theories out there and all are controversial. Just as man has evolved, why wouldn't animals ?

Think about it, anoles,geckos etc have a likeness to dinosaurs, so what if they are the descendents of prehistoric dinos and we are the descendents of the aliens ? just a thought....

Kelley Marks (author) from Sacramento, California on June 15, 2012:

Thanks for the comment, topaz blue. I can't resist writing anything about dinosaurs or ancient aliens and when you put them together they're to-die-for. Later!

topaz blue on June 15, 2012:


Very interesting and thought provoking hub! I hadn't even contemplated that a planned extinction may have occurred.

Many thanks for a great read!

Topaz Blue

Kelley Marks (author) from Sacramento, California on June 11, 2012:

Thanks for the comment, leann2800. The so-called experts on "Ancient Aliens" certainly like to expound upon far-fetched theories such as the one about which I wrote this hub. Actually I've written a number of hubs which mention that show. At any rate, they've given me a lot to write about, which ain't so bad, ya know? Later!

leann2800 on June 11, 2012:

I love the History Channel but Ancient Aliens is so bogus that my husband avoids the History Channel to avoid the rants I go on about the bogus theories on that show...should have wrote a hub instead. You did a great job!

Kelley Marks (author) from Sacramento, California on June 11, 2012:

Thanks for the comment, markbennis. There's certainly much food for thought in this story, and I'm not ruling out anything, though I lean toward that which can be verified by fact, not fantasy. Of course, the fantasy can be fun too, particularly if one if writing a screenplay. Later!

markbennis on June 11, 2012:

Great hub and plenty food for thought herein, if the dinosaurs had existed for around 160 million years, before they wet extinct. Could it have been possible that a type of reptilian/dinosaur could have evolved into something, considered as an advanced species?

After all that is a very long time for the genetics to have evolved into something, maybe?

The extraterrestrial question is a definite yes in my opinion. So the possibility of an orchestrated cataclysm could be very possible, from a very advanced race of beings?

Then again, it may have just been an asteroid that happened randomly, again all possibilities are fair.

Thought provoking and intriguing but a very valuable insight and the questions unless proven, are as credible as the questions of an Asteroid impact.

Voted up!

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