A post from 2015: "Cruithne completes a full orbit around Earth once every 800 years, but during that same amount of time, it completes roughly 800 orbits around the sun. That's because Cruithne is more gravitationally bound to the sun than Earth, and for that reason it does not qualify as our moon."
@@jonmobrien they themselves admit their facts decay over time… having said this, yes, they do get a lot of things wrong. It’s still a fun show to watch :)
@@eleanor.shadow But this wasn't a case where they were right at one point, and "the half-life of facts" caught up with them later. They were wrong from day one, and they continued to be wrong with their "corrections".
@@rossjackson7352 That's called the barycenter. All orbiting bodies do that. In fact all the planets in our solar system have a shared barycenter with the sun. But this does not make the moon a planet.
@@rossjackson7352 According to one article about that definition (which YT won't allow me to link to)... "And if you read back to an IAU interview in 2006, you’ll see that at that time, the IAU defined a “double planet” as a system where both bodies meet the definition of a planet, and the barycenter is not inside either one of the objects. So for now, the Earth is a planet and the Moon a satellite - at least under IAU rules." In a few million years the IAU will be completely right about the moon and earth being a binary planet system. LOL Cheers.
I remember them doing a thing in one of the later series where thay gave back points based on incorrect answers that were later proven true. Alan got something like two thousand points from it. I assume it would have been covered by that.
It doesn't have two satellites either. The elves don't know the definition of moon includes having to be a satellite of the planet which Cruithne isn't. It's an asteroid going around the sun.
Not quite. QI is all about "not quite" questions, and the reality is cruithne is a co-orbital object, meaning it shares it's orbit with both the sun and the earth.
Interestingly enough, the Earth has only one moon, because Cruithne, which is an asteroid, orbits the sun 800 times for each orbit of the Earth. Since Cruithne is more gravitationally bound by the Sun, it has been disqualified at being a moon from Earth. So I'm afraid the show got it wrong, but at the very least, it was very interesting.
While Cruithne is not a moon of the earth, despite it sometimes being referred to as Earth's second moon, a comet has an entirely different makeup. Some sort of orbital path alone is not what defines moons and comets. You'd have more reasons that Halley's comet doesn't count as an earth moon than you'd have reasons to not count Cruithne.
Yes and no. In a later episode they asked again how many moons the earth has and changed the answer to "nobody knows because science keeps changing", making a round where any answer got a klaxxon. But they didn't admit that *at the time they said the answer was two* it was already known they were wrong. The QI elves acted like it was some kind of new fact and science has changed its mind, not admitting the elves got it wrong entirely on their own, not understanding the existing knowledge at the time of this episode.
As has been said elsewhere the name Cruithne is, in this case, from (Middle) Irish and refers to the early Picts (Old Irish: Cruthin) in the Annals of Ulster; and their eponymous king Cruidne, son of Cinge in the Pictish Chronicle.
Y'know, my worst nightmare would be to be caught in a spelling bee, where the prize was something really important... and all the words were traditional Irish names. 😱 ( I've liked Saoirse Ronan in everything I've ever seen the kid in, but feel so sorry for her when someone tries to pronounce her name. ) And this is coming from someone who's got a fair amount of Irish in his ancestry. ( 1/3 of my mom's side of the family. ) Seriously, the Irish seem to take a perverse pleasure in spelling things ANY WAY other than how they sound. * shakes head *
@@guarddog318 Irish pronunciation is very simple when you know the rules. How well can you pronounce French, German, Russian or Chinese names? It disgusts me the disrespect shown by so many people for my language.
@@PanglossDr - I've studied many languages over the years, being more than a little fascinated with history. And I can assure you that the one that's given me the most trouble is that of some of my own ancestors, the Irish. German? No problem. French? The same. Chinese? 30 years of martial arts classes tended to any trouble I may have had with Japanese, Chinese, Korean, etc. But trying to work both my head and tongue around Irish/Gaelic? Ouch. Somebody bring me a strong drink and some ibuprofen. P.S. What should disgust you the most is what the Romans, Germans, and later the English did to the Irish culture... especially since the whole reason I'm part Irish is all those sent to the U.S. as basically slaves, thought too worthless for anybody but the natives to marry. As I said elsewhere, my mom's side of the family is 2/3 Native american, and 1/3 Irish... and that dates back to the 1700s.
@@PanglossDr - One other thing: The problem with Irish isn't the language itself, it's the written translation for Ogham, to Latin, to finally the modern English alphabet, which is derived from Latin and Germanic runes. ( That last being the 'FUTHORIC' which is the Anglo-Saxon version of the Norse runes. ) Somewhere in there someone got unnecessarily particular about making Irish stand out, and simply didn't go with the most logical spelling for the various pronunciations. Evidence for this? Well, why else would an Irish singer/musician with the given name Eithne Pádraigín Ní Bhraonáin decide "Screw it, I want people to know who I am and how to say my name!" and go with the anglicised "Enya"? As I've said, I know a fair bit about languages, and Irish is unnecessarily problematic when translated to English. and that's even when compared to other languages that use their own native alphabets like Greek, Russian, etc. In the end, don't blame ME for what someone else did to your language, at least in its written form. Because although I can probably learn to speak it just fine -or at least passably so - I doubt very seriously that I'd ever have the facility with writing and spelling with it that I do with many others. ( I have no trouble reading/translating something written in Ogham. I can tell you what the letters are easily enough. Just don't ask me to speak 'em without some sort of guide book. )
The QI elves don't know what a moon is. A moon is a satellite that isn't artificial. Cruithne is not a satellite of Earth. It's a satellite of the sun, same as all the other similar asteroids that cross Earth's orbit. Yes you can make it look like it goes around Earth using an Earth-centered reference frame but that's true of most objects in the solar system including other planets. It's not going around Earth *because of Earth's gravity* which is the reason it's not a satellite of Earth and thus not a moon. If you use a definition that allows Cruithne to be a moon of Earth the then answer still isn't two moons, then it becomes hundreds. A definition that allows Cruithne to be Earth's moon allows many other objects to be as well.
And in fact there was an episode of QI where they clearly said that there are hundreds of moons. And another one where they said there are no moons. The point was that it depends on how you define a moon, and at the time they had enough leeway to get away with saying there were two. It was only a trick question to take points away from Alan after all…
@@lidbass I've seen the later episode where they did that but they never admitted that they were just flat out wrong (which they were). They pretended it was because new information had come out since then, when no, it's that they were already known to be wrong at the time. I much prefer their podcast No Such Thing As A Fish, where they're a lot more honest about the fact that they're just curious people googling interesting stuff they don't always understand. They're a lot more humble and honest in the podcast. The QI format with the klaxxon presents the notion that their one hour of googling proves experts incorrect. Them finding out for the first time about the existence of Cruithne and then confidently claiming that means the Earth has two moons is akin to that crazy uncle who "did his own research" to prove he knows that COVID-19 is really caused by 5G antennas.
@@dunbar9finger I find it to be quite interesting if I am honest. Funny to talk about with the family. First it is two moons, later it is either one or seven.. even more later it is hundreds. At the end of the day it is a show which provides entertainment value in my perspective. You had a good explanation though.
Its full name is 3753 Cruithne and its orbit is the shape of a cross between a horseshoe and a doughnut. Relative to Earth it is a co-orbital quasi-satellite
@@petergaskin1811 No, its orbit is near elliptical round the Sun. You could take away the Earth while its orbit might change somewhat, it would still orbit round the Sun. At no point is its orbit retrograde.
While "the one we know" is called "the moon" it's proper name is Luna (just as "the sun" is named Sol"). It's just uncommon that we call it by its name. Edit: Also, Cruithne is outside Earth's Hill sphere, so it doesn't fit the definition of satellite (or moon).
That's a bit like claiming Killer Whales have a "proper name" other than Killer Whale. They don't, and the proper names of the moon and the sun are The Moon and The Sun.
@@vangroover1903 The proper name of "killer whale" is orca. But, this is different to "the moon" & "the sun" because those use the definite article-which indicates moon & sun are mere nouns, not proper nouns.
You gotta wonder. Like the "What's the correct way to peel a banana?" question. I think they must scour the earth until they find the one contrarian who tells them that everyone else in the world has it all wrong.
i am vaguely disappointed that people here has yet to mention that random shit gets pulled into and kicked out of Earth's orbit all the time, which means we have had a lot of temporary "second moons"
@@RubelliteFae a completely different language with sounds and intonations that are incredibly difficult for a native english speaker to guess, more like it. not defending the historical changing of town names as mentioned by LittleKing Archery, obviously, just the panelists' mispronunciation, which most non-irish speakers would also have made.
Cruithne is NOT a second earth moon, this is totally wrong. It's not a second moon for Earth; it doesn't orbit Earth. But Cruithne is co-orbiting the sun with Earth. Like all quasi-satellites, Cruithne orbits the sun once for every orbit of Earth.
Sounds like a sneeze And its an asteroid that orbits the sun, apparently, not Erf. “Orbital resonance…co-orbital object…quasi satellite” between Mercury, Mars and even the other side of the sun. Stretches the meaning of a moon, really.
And, importantly, stretches the definition in a way that still doesn't make the correct answer "two" like they claimed. Many other asteroids also fit the same profile Cruithne does. If you change the definition of "moon" to include Cruithne the you have also roped in lots of other asteroids into that redefinition.
There is only one Moon. The same as there is only one Earth. Moon is a natural satellite of Earth, and we might as well find other natural satellites. One of those episodes we wish we had David Mitchell. :)
From a more informed future the Earth doesn't have any moons. The Earth and its co-planet the body we call the Moon are a binary planet system with two planets circling a common center that is just under the surface of the Earth.
But that's true of all moons. They always orbit a spot that's not exactly at the parent planet's center because they pull on the parent planet too. You pretend you are citing a difference of category when it's just a difference of degree. All moons do this, but Earth's moon just does it to a larger degree. Until the barycenter is all the way outside the parent planet it's not called a double planet system. The earth moon system falls just shy of doing that.
But a _better-informed_ future looks at how astronomers define a binary planet. To be a binary (aka double planet), the barycenter (the common center of mass of the two bodies) has to be in the space between them. The Earth/Moon barycenter is not "just under the surface of the Earth". It's about 1000 miles below the surface.
Well Crueenya rhymes with loads of things. Kenya. Xenia, though good luck writing a romantic song about a town famous for having been hit by a large tornado. Fly me to Crueenya...it's much better than Xenia...quite far from Kenya...I hope I don't get septicemiaaaaaaaaa! *bows*
A post from 2015: "Cruithne completes a full orbit around Earth once every 800 years, but during that same amount of time, it completes roughly 800 orbits around the sun. That's because Cruithne is more gravitationally bound to the sun than Earth, and for that reason it does not qualify as our moon."
Yes, 90% of the stuff on this show is misleading or outright incorrect. It's a shame because otherwise it is Quite Interesting.
@@jonmobrien they themselves admit their facts decay over time… having said this, yes, they do get a lot of things wrong. It’s still a fun show to watch :)
@@eleanor.shadow But this wasn't a case where they were right at one point, and "the half-life of facts" caught up with them later. They were wrong from day one, and they continued to be wrong with their "corrections".
QI only needs to be right 1 in 800 times.
@@jonmobrien 90% is misleading? 🤣
Give Allen his 10 points back.
They did: czcams.com/video/8kBD3lOax44/video.html
@@rossjackson7352
That's called the barycenter. All orbiting bodies do that. In fact all the planets in our solar system have a shared barycenter with the sun.
But this does not make the moon a planet.
Well they did later give him several hundred points back for all the questions he technically got right
@@rossjackson7352
According to one article about that definition (which YT won't allow me to link to)...
"And if you read back to an IAU interview in 2006, you’ll see that at that time, the IAU defined a “double planet” as a system where both bodies meet the definition of a planet, and the barycenter is not inside either one of the objects. So for now, the Earth is a planet and the Moon a satellite - at least under IAU rules."
In a few million years the IAU will be completely right about the moon and earth being a binary planet system. LOL
Cheers.
@@rossjackson7352 TLDR .
"Luna is a planet, not a moon."
Not according to your source.
For those who remember Rich Hall on future shows
"How many moons we talkin Stephen?"
"Because it was discovered in nineteen-ninety ******* four!"
Rare footage of Stephen Fry get exasperated at someone who *isn't* Alan!
Was half expecting Bill to pull out a load of instruments and make up a song on the spot
Still one of my all-time favourite QI clips. I am slightly in love with Rich Hall.
"where is 90% of the universe?"
Have you checked the sofa cushions?
Alan should get his points back.... Earth might have two satellites but only one of them is the Moon!
I remember them doing a thing in one of the later series where thay gave back points based on incorrect answers that were later proven true. Alan got something like two thousand points from it. I assume it would have been covered by that.
It doesn't have two satellites either. The elves don't know the definition of moon includes having to be a satellite of the planet which Cruithne isn't. It's an asteroid going around the sun.
@@dunbar9finger it has _way_ more than two satellites. There’s five or six just for GPS! I _love_ the satnav moons.
@@oricalu448 Half life of facts: czcams.com/video/8kBD3lOax44/video.html
Cruithne is the ancient Gaelic name for the Picts, who they united with to form the country of Scotland.
And I believe it translates as "cunts" which says many things about both the pics and their victims.
And is pronounced krihnye.
@@johnboyce8279 or crih-na in modern Gaeilge, depending on dialects
The Picts didn't speak Gaelic, that was the Scots who came from Ireland.
United is a little charitable to the Scots
It doesn't qualify as a moon as it's bound to the sun and not the earth.
Not quite.
QI is all about "not quite" questions, and the reality is cruithne is a co-orbital object, meaning it shares it's orbit with both the sun and the earth.
Although it doesn't orbit the earth. As such. It all get a a bit tricky, if I'm honest.
@@peterclarke7240 if it doesn't orbit the earth then it is not a satellite of earth. Its just an NEO.
@@benjamindrayton1380 I never said it was a satellite of earth, I said it was a co-orbital object. Which it is. Look it up.
@@peterclarke7240 which means the original poster was right. It is not a moon. QED.
Interestingly enough, the Earth has only one moon, because Cruithne, which is an asteroid, orbits the sun 800 times for each orbit of the Earth. Since Cruithne is more gravitationally bound by the Sun, it has been disqualified at being a moon from Earth. So I'm afraid the show got it wrong, but at the very least, it was very interesting.
show was broadcast in 2003, Cruithne orbit was discovered in 97 so they were correct at the time of broadcast as far as anyone knew at the time
@@andreww2098 They were very wrong at the time of the broadcast. It was already known that it was an Aten asteroid.
In another QI they said that facts have an average life of 7 years so this fact is close to that lifespan
@@dacramac3487 yes a Q-Type Aten asteroid.
I think you'll find it's quite interesting 😋
There was another episode with the same question, Alan answered that time "two" and he was incorrect.
99% percent of all factoids are false.
It was either one or seven ^^. He also said 3, 4 and 5 if I remember correctly.
Blue Whale.
I thought at least one of them (Alan as he was doing a rap) would have said, "Crueenya, no one's ever fucking seen ya!"
I think it so extraordinary that QI comes up with this s---t!
May at least one music artist sing a song about Cruithne
If Cruithne counts as a moon, then so does Halley's Comet, and that's bullshit
While Cruithne is not a moon of the earth, despite it sometimes being referred to as Earth's second moon, a comet has an entirely different makeup. Some sort of orbital path alone is not what defines moons and comets. You'd have more reasons that Halley's comet doesn't count as an earth moon than you'd have reasons to not count Cruithne.
i believe it's mostly ice, but i take your point.
So nice to see Jeremy Hardy.
Such a loss.
90% of the universe is Ruth.
Remember Ruth?
And so it begins
you can tell it's an old clip, look hot young Alan and Stephen look!
Didn’t they do a correction on this a few years later?
I vaguely recall Alan having a comedy rant about it.
Yes and no. In a later episode they asked again how many moons the earth has and changed the answer to "nobody knows because science keeps changing", making a round where any answer got a klaxxon. But they didn't admit that *at the time they said the answer was two* it was already known they were wrong. The QI elves acted like it was some kind of new fact and science has changed its mind, not admitting the elves got it wrong entirely on their own, not understanding the existing knowledge at the time of this episode.
Bryan Adams everything i do i do it for you was 1991, before the discover of Cruithne
2:29 thanks Steven, though you should have known better considering you were on Ros na Rún
It's what they call a pseudosatellite
I am over the Cruithny by these news!
Name a song that. Challenge accepted.
I'm a Pieces.
Cruithne is the Irish word for wheat. It is pronounced crwi-ni.
As has been said elsewhere the name Cruithne is, in this case, from (Middle) Irish and refers to the early Picts (Old Irish: Cruthin) in the Annals of Ulster; and their eponymous king Cruidne, son of Cinge in the Pictish Chronicle.
Y'know, my worst nightmare would be to be caught in a spelling bee, where the prize was something really important... and all the words were traditional Irish names. 😱
( I've liked Saoirse Ronan in everything I've ever seen the kid in, but feel so sorry for her when someone tries to pronounce her name. )
And this is coming from someone who's got a fair amount of Irish in his ancestry. ( 1/3 of my mom's side of the family. )
Seriously, the Irish seem to take a perverse pleasure in spelling things ANY WAY other than how they sound. * shakes head *
@@guarddog318 Irish pronunciation is very simple when you know the rules. How well can you pronounce French, German, Russian or Chinese names?
It disgusts me the disrespect shown by so many people for my language.
@@PanglossDr - I've studied many languages over the years, being more than a little fascinated with history.
And I can assure you that the one that's given me the most trouble is that of some of my own ancestors, the Irish.
German? No problem. French? The same. Chinese? 30 years of martial arts classes tended to any trouble I may have had with Japanese, Chinese, Korean, etc.
But trying to work both my head and tongue around Irish/Gaelic? Ouch. Somebody bring me a strong drink and some ibuprofen.
P.S. What should disgust you the most is what the Romans, Germans, and later the English did to the Irish culture... especially since the whole reason I'm part Irish is all those sent to the U.S. as basically slaves, thought too worthless for anybody but the natives to marry.
As I said elsewhere, my mom's side of the family is 2/3 Native american, and 1/3 Irish... and that dates back to the 1700s.
@@PanglossDr - One other thing: The problem with Irish isn't the language itself, it's the written translation for Ogham, to Latin, to finally the modern English alphabet, which is derived from Latin and Germanic runes. ( That last being the 'FUTHORIC' which is the Anglo-Saxon version of the Norse runes. )
Somewhere in there someone got unnecessarily particular about making Irish stand out, and simply didn't go with the most logical spelling for the various pronunciations.
Evidence for this? Well, why else would an Irish singer/musician with the given name Eithne Pádraigín Ní Bhraonáin decide "Screw it, I want people to know who I am and how to say my name!" and go with the anglicised "Enya"?
As I've said, I know a fair bit about languages, and Irish is unnecessarily problematic when translated to English. and that's even when compared to other languages that use their own native alphabets like Greek, Russian, etc.
In the end, don't blame ME for what someone else did to your language, at least in its written form.
Because although I can probably learn to speak it just fine -or at least passably so - I doubt very seriously that I'd ever have the facility with writing and spelling with it that I do with many others.
( I have no trouble reading/translating something written in Ogham. I can tell you what the letters are easily enough. Just don't ask me to speak 'em without some sort of guide book. )
The QI elves don't know what a moon is. A moon is a satellite that isn't artificial. Cruithne is not a satellite of Earth. It's a satellite of the sun, same as all the other similar asteroids that cross Earth's orbit. Yes you can make it look like it goes around Earth using an Earth-centered reference frame but that's true of most objects in the solar system including other planets. It's not going around Earth *because of Earth's gravity* which is the reason it's not a satellite of Earth and thus not a moon.
If you use a definition that allows Cruithne to be a moon of Earth the then answer still isn't two moons, then it becomes hundreds. A definition that allows Cruithne to be Earth's moon allows many other objects to be as well.
And in fact there was an episode of QI where they clearly said that there are hundreds of moons.
And another one where they said there are no moons.
The point was that it depends on how you define a moon, and at the time they had enough leeway to get away with saying there were two. It was only a trick question to take points away from Alan after all…
@@lidbass I've seen the later episode where they did that but they never admitted that they were just flat out wrong (which they were). They pretended it was because new information had come out since then, when no, it's that they were already known to be wrong at the time. I much prefer their podcast No Such Thing As A Fish, where they're a lot more honest about the fact that they're just curious people googling interesting stuff they don't always understand. They're a lot more humble and honest in the podcast. The QI format with the klaxxon presents the notion that their one hour of googling proves experts incorrect. Them finding out for the first time about the existence of Cruithne and then confidently claiming that means the Earth has two moons is akin to that crazy uncle who "did his own research" to prove he knows that COVID-19 is really caused by 5G antennas.
@@dunbar9finger I find it to be quite interesting if I am honest. Funny to talk about with the family. First it is two moons, later it is either one or seven.. even more later it is hundreds.
At the end of the day it is a show which provides entertainment value in my perspective.
You had a good explanation though.
Its full name is 3753 Cruithne and its orbit is the shape of a cross between a horseshoe and a doughnut. Relative to Earth it is a co-orbital quasi-satellite
@@petergaskin1811 No, its orbit is near elliptical round the Sun. You could take away the Earth while its orbit might change somewhat, it would still orbit round the Sun. At no point is its orbit retrograde.
I hate to be pedantic over a good joke but it's "Blue moon, you saw me standing alone..."
While "the one we know" is called "the moon" it's proper name is Luna (just as "the sun" is named Sol"). It's just uncommon that we call it by its name.
Edit: Also, Cruithne is outside Earth's Hill sphere, so it doesn't fit the definition of satellite (or moon).
That's a bit like claiming Killer Whales have a "proper name" other than Killer Whale. They don't, and the proper names of the moon and the sun are The Moon and The Sun.
@@vangroover1903 The proper name of "killer whale" is orca.
But, this is different to "the moon" & "the sun" because those use the definite article-which indicates moon & sun are mere nouns, not proper nouns.
You gotta wonder. Like the "What's the correct way to peel a banana?" question. I think they must scour the earth until they find the one contrarian who tells them that everyone else in the world has it all wrong.
That's no moon...
...nor a Space Station...
(yet)
i am vaguely disappointed that people here has yet to mention that random shit gets pulled into and kicked out of Earth's orbit all the time, which means we have had a lot of temporary "second moons"
As an Irish person, hearing the mispronunciation was damaging to my ears and also explains a lot about the way town names have been changed…
You should complain that your feelings have been hurt and bomb somebody for it.
surely you can understand where the mistake comes from, no?
@@MacIntoshMann Cultural bias, innit?
@@RubelliteFae a completely different language with sounds and intonations that are incredibly difficult for a native english speaker to guess, more like it.
not defending the historical changing of town names as mentioned by LittleKing Archery, obviously, just the panelists' mispronunciation, which most non-irish speakers would also have made.
@@MacIntoshMann Yeah. Linguistic bias is one aspect of cultural bias. That's not a judgement, simply a description.
Look it up on Wikipedia. It DOESN'T orbit the Earth. 3753 Cruithne "near Earth" asteroid.
Cruithne is NOT a second earth moon, this is totally wrong. It's not a second moon for Earth; it doesn't orbit Earth. But Cruithne is co-orbiting the sun with Earth. Like all quasi-satellites, Cruithne orbits the sun once for every orbit of Earth.
Sounds like a sneeze
And its an asteroid that orbits the sun, apparently, not Erf. “Orbital resonance…co-orbital object…quasi satellite” between Mercury, Mars and even the other side of the sun. Stretches the meaning of a moon, really.
This 'Erf' body you speak of threw me off for a bit, but I disgress thanks for the info.
And, importantly, stretches the definition in a way that still doesn't make the correct answer "two" like they claimed. Many other asteroids also fit the same profile Cruithne does. If you change the definition of "moon" to include Cruithne the you have also roped in lots of other asteroids into that redefinition.
There is only one Moon. The same as there is only one Earth. Moon is a natural satellite of Earth, and we might as well find other natural satellites. One of those episodes we wish we had David Mitchell. :)
Wrong QI it's gravitationally bound to the sun not the Earth. It's an asteroid not a moon....
Not a moon of the earth
Yes, it's not a moon. It's only an asteroid that's "co-orbital" wth Earth. Also, Stephen used a common mispronunciation.
@@KCLBrunel Not even. It still revolves around the sun, but it just happens to get influenced by the earth temporarily as it passes by.
@@ThatDamnPandaKai I've edited my comment, removing the term quasi-satellite.
It's not a moon though.
From a more informed future the Earth doesn't have any moons. The Earth and its co-planet the body we call the Moon are a binary planet system with two planets circling a common center that is just under the surface of the Earth.
Oh god,there's one in every crowd.✌️
an informed _future_ would actually say the Earth doesn't have a moon because it receded so much it left orbit...
@@nagranoth_ - one way to describe your hairline....
But that's true of all moons. They always orbit a spot that's not exactly at the parent planet's center because they pull on the parent planet too. You pretend you are citing a difference of category when it's just a difference of degree. All moons do this, but Earth's moon just does it to a larger degree. Until the barycenter is all the way outside the parent planet it's not called a double planet system. The earth moon system falls just shy of doing that.
But a _better-informed_ future looks at how astronomers define a binary planet. To be a binary (aka double planet), the barycenter (the common center of mass of the two bodies) has to be in the space between them. The Earth/Moon barycenter is not "just under the surface of the Earth". It's about 1000 miles below the surface.
Not a moon!
Cruithne is the common name given to asteroid 3753......asteroid!
Cruithne is Gaelic for Wheat
This is wrong. Cruithne is not gravitationally attracted to the earth. The elves fucked up. It’s not a moon.
This is misleading. Earth has one moon.
Well Crueenya rhymes with loads of things. Kenya. Xenia, though good luck writing a romantic song about a town famous for having been hit by a large tornado.
Fly me to Crueenya...it's much better than Xenia...quite far from Kenya...I hope I don't get septicemiaaaaaaaaa!
*bows*
It's dreamier than leukemia.
And creamier than bulimia.
@@johneyton5452 That's disgusting.
Not only is Cruithne not a moon, they also got the year of it's discovery wrong. I love this show, but they really needed better elves.
This s horse dump … Cruithne is more gravitationally attached to the sun and cannot, I repeat, cannot be classified as a moon of the earth…
It is a moon of the Sun, NOT the Earth!
Rich Hall is the least funny guest on QI.
The reality is that it is not a moon as it does not orbit the Earth, someone did make up this shit.