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Existence of a celestial body big enough for early civilization to be thought of as a second moon


A world with a moon orbiting much closer than oursOrbiting one star in a binary system: what are the effects of the second star on the planet?Could a civilization engineer supernovae?Two orbits, Four habitable planets in the goldilocks zone?Which gas giant of the solar system could humanity mine and for what resource?How could a TINY Second Moon minimally affect Earth?Is a 1:1 Earth possible in a binary system?How to determine the population size and spread in a fictional ancient world settlingHorseshoe OrbitsDay/night cycle science help?













10












$begingroup$


Is there a possible scenario in which once a year a celestial body can be seen from the surface of the Earth-like planet for a short period of time?



  • With it being big enough for early civilization to consider it a second moon but much smaller than the actual one.

  • And occurring each year for one thousand years.

I thought two moons questions are similar enough, but I haven't found a proper answer for myself.



Thank you!










share|improve this question









New contributor




shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    Humans considered all celestial bodies to be going around the Earth until a chap named Copernicus (and some of his contemporaries) suggested otherwise. I doubt the size would make a difference or periodicity.
    $endgroup$
    – StephenG
    2 days ago






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. What do you mean by "occurring for 1,000 years"? Do you mean the moon is in the sky, visible and basically the same size, for a 1,000 year period, or that the inhabitants see it once every 1,000 years, like a comet?
    $endgroup$
    – JBH
    2 days ago










  • $begingroup$
    @StephenG true, but not all of them were considered moons.
    $endgroup$
    – shootshi
    2 days ago






  • 3




    $begingroup$
    Thanks, please edit your question with the clarification. Never depend on people reading through the comments to find clarifications. Cheers!
    $endgroup$
    – JBH
    2 days ago






  • 2




    $begingroup$
    Just to say, it is custom here to wait 24 hours after asking a question before awarding acceptance, otherwise it can discourage other, perhaps better answers - this policy benefits the comunity.
    $endgroup$
    – Agrajag
    2 days ago















10












$begingroup$


Is there a possible scenario in which once a year a celestial body can be seen from the surface of the Earth-like planet for a short period of time?



  • With it being big enough for early civilization to consider it a second moon but much smaller than the actual one.

  • And occurring each year for one thousand years.

I thought two moons questions are similar enough, but I haven't found a proper answer for myself.



Thank you!










share|improve this question









New contributor




shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$











  • $begingroup$
    Humans considered all celestial bodies to be going around the Earth until a chap named Copernicus (and some of his contemporaries) suggested otherwise. I doubt the size would make a difference or periodicity.
    $endgroup$
    – StephenG
    2 days ago






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. What do you mean by "occurring for 1,000 years"? Do you mean the moon is in the sky, visible and basically the same size, for a 1,000 year period, or that the inhabitants see it once every 1,000 years, like a comet?
    $endgroup$
    – JBH
    2 days ago










  • $begingroup$
    @StephenG true, but not all of them were considered moons.
    $endgroup$
    – shootshi
    2 days ago






  • 3




    $begingroup$
    Thanks, please edit your question with the clarification. Never depend on people reading through the comments to find clarifications. Cheers!
    $endgroup$
    – JBH
    2 days ago






  • 2




    $begingroup$
    Just to say, it is custom here to wait 24 hours after asking a question before awarding acceptance, otherwise it can discourage other, perhaps better answers - this policy benefits the comunity.
    $endgroup$
    – Agrajag
    2 days ago













10












10








10





$begingroup$


Is there a possible scenario in which once a year a celestial body can be seen from the surface of the Earth-like planet for a short period of time?



  • With it being big enough for early civilization to consider it a second moon but much smaller than the actual one.

  • And occurring each year for one thousand years.

I thought two moons questions are similar enough, but I haven't found a proper answer for myself.



Thank you!










share|improve this question









New contributor




shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




Is there a possible scenario in which once a year a celestial body can be seen from the surface of the Earth-like planet for a short period of time?



  • With it being big enough for early civilization to consider it a second moon but much smaller than the actual one.

  • And occurring each year for one thousand years.

I thought two moons questions are similar enough, but I haven't found a proper answer for myself.



Thank you!







space earth-like






share|improve this question









New contributor




shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 2 days ago









Willk

113k27211476




113k27211476






New contributor




shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 2 days ago









shootshishootshi

535




535




New contributor




shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






shootshi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











  • $begingroup$
    Humans considered all celestial bodies to be going around the Earth until a chap named Copernicus (and some of his contemporaries) suggested otherwise. I doubt the size would make a difference or periodicity.
    $endgroup$
    – StephenG
    2 days ago






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. What do you mean by "occurring for 1,000 years"? Do you mean the moon is in the sky, visible and basically the same size, for a 1,000 year period, or that the inhabitants see it once every 1,000 years, like a comet?
    $endgroup$
    – JBH
    2 days ago










  • $begingroup$
    @StephenG true, but not all of them were considered moons.
    $endgroup$
    – shootshi
    2 days ago






  • 3




    $begingroup$
    Thanks, please edit your question with the clarification. Never depend on people reading through the comments to find clarifications. Cheers!
    $endgroup$
    – JBH
    2 days ago






  • 2




    $begingroup$
    Just to say, it is custom here to wait 24 hours after asking a question before awarding acceptance, otherwise it can discourage other, perhaps better answers - this policy benefits the comunity.
    $endgroup$
    – Agrajag
    2 days ago
















  • $begingroup$
    Humans considered all celestial bodies to be going around the Earth until a chap named Copernicus (and some of his contemporaries) suggested otherwise. I doubt the size would make a difference or periodicity.
    $endgroup$
    – StephenG
    2 days ago






  • 1




    $begingroup$
    Welcome to Worldbuilding.SE! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. What do you mean by "occurring for 1,000 years"? Do you mean the moon is in the sky, visible and basically the same size, for a 1,000 year period, or that the inhabitants see it once every 1,000 years, like a comet?
    $endgroup$
    – JBH
    2 days ago










  • $begingroup$
    @StephenG true, but not all of them were considered moons.
    $endgroup$
    – shootshi
    2 days ago






  • 3




    $begingroup$
    Thanks, please edit your question with the clarification. Never depend on people reading through the comments to find clarifications. Cheers!
    $endgroup$
    – JBH
    2 days ago






  • 2




    $begingroup$
    Just to say, it is custom here to wait 24 hours after asking a question before awarding acceptance, otherwise it can discourage other, perhaps better answers - this policy benefits the comunity.
    $endgroup$
    – Agrajag
    2 days ago















$begingroup$
Humans considered all celestial bodies to be going around the Earth until a chap named Copernicus (and some of his contemporaries) suggested otherwise. I doubt the size would make a difference or periodicity.
$endgroup$
– StephenG
2 days ago




$begingroup$
Humans considered all celestial bodies to be going around the Earth until a chap named Copernicus (and some of his contemporaries) suggested otherwise. I doubt the size would make a difference or periodicity.
$endgroup$
– StephenG
2 days ago




1




1




$begingroup$
Welcome to Worldbuilding.SE! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. What do you mean by "occurring for 1,000 years"? Do you mean the moon is in the sky, visible and basically the same size, for a 1,000 year period, or that the inhabitants see it once every 1,000 years, like a comet?
$endgroup$
– JBH
2 days ago




$begingroup$
Welcome to Worldbuilding.SE! We're glad you could join us! When you have a moment, please click here to learn more about our culture and take our tour. What do you mean by "occurring for 1,000 years"? Do you mean the moon is in the sky, visible and basically the same size, for a 1,000 year period, or that the inhabitants see it once every 1,000 years, like a comet?
$endgroup$
– JBH
2 days ago












$begingroup$
@StephenG true, but not all of them were considered moons.
$endgroup$
– shootshi
2 days ago




$begingroup$
@StephenG true, but not all of them were considered moons.
$endgroup$
– shootshi
2 days ago




3




3




$begingroup$
Thanks, please edit your question with the clarification. Never depend on people reading through the comments to find clarifications. Cheers!
$endgroup$
– JBH
2 days ago




$begingroup$
Thanks, please edit your question with the clarification. Never depend on people reading through the comments to find clarifications. Cheers!
$endgroup$
– JBH
2 days ago




2




2




$begingroup$
Just to say, it is custom here to wait 24 hours after asking a question before awarding acceptance, otherwise it can discourage other, perhaps better answers - this policy benefits the comunity.
$endgroup$
– Agrajag
2 days ago




$begingroup$
Just to say, it is custom here to wait 24 hours after asking a question before awarding acceptance, otherwise it can discourage other, perhaps better answers - this policy benefits the comunity.
$endgroup$
– Agrajag
2 days ago










2 Answers
2






active

oldest

votes


















14












$begingroup$

Yes. That would be a kind of quasi-satellite.



And Earth already has a small one - it's called Cruithne. At perigee, a larger Cruithne might well be visible, always in the same section of the sky.



enter image description here



A larger body would be less stable, but if you only need one thousand years, I think it could work out.



As rightfully pointed out by Ville Niemi, in this context "less stable" might have very, very dire consequences - you might be looking at a Theia-like endgame. Emphasis on the "end".






share|improve this answer











$endgroup$








  • 5




    $begingroup$
    Just wanted to point out this despite it not being in the question. I think the "failure mode" for this solution would be pretty bad. I mean, if I had bought this solution from a world building agency I would want my money back or at least very good insurance for my civilization bundled in the deal.
    $endgroup$
    – Ville Niemi
    2 days ago






  • 1




    $begingroup$
    @VilleNiemi, is there such a real thing as a "world building agency", or is that just a Douglas Adams style joke?
    $endgroup$
    – EveryBitHelps
    2 days ago






  • 1




    $begingroup$
    @EveryBitHelps Obviously building planet scale objects to specification requires highly specialized equipment and expertise. Simple economics requires it is handled by an organization specialized in it.
    $endgroup$
    – Ville Niemi
    yesterday










  • $begingroup$
    @VilleNiemi damn, here I though there where some ppl offering dedicated wb services to help with our geeky hobbies! Besides those of us here on wb.se.
    $endgroup$
    – EveryBitHelps
    yesterday


















11












$begingroup$

A comet could fill this role. Comets are notoriously bright.



comet
https://en.wikipedia.org/wiki/File:Comet_P1_McNaught02_-_23-01-07.jpg



I like the tail but you could have your celestial body be made of something more solid, equally reflective, but not falling apart and leaving the tail.



Comets also have very elliptical orbits and visit infrequently. In this list of periodic comets, 3200 Phaeton has a period of 1.4 years - very short by comet standards.



https://en.wikipedia.org/wiki/3200_Phaethon



3200 phaeton orbit



So: your second moon is a very bright short period comet. That seems plausible.






share|improve this answer









$endgroup$












  • $begingroup$
    This could work, but probably not for very long - a short period comet would have less volatiles, and likely not last for one thousand years (and a large comet would be less stable). But yes, especially if it came from outside the ecliptic, it would be plausible and is a much better solution than a 'quasi-satellite'. ( thenakedscientists.com/articles/questions/… )
    $endgroup$
    – LSerni
    2 days ago










Your Answer





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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









14












$begingroup$

Yes. That would be a kind of quasi-satellite.



And Earth already has a small one - it's called Cruithne. At perigee, a larger Cruithne might well be visible, always in the same section of the sky.



enter image description here



A larger body would be less stable, but if you only need one thousand years, I think it could work out.



As rightfully pointed out by Ville Niemi, in this context "less stable" might have very, very dire consequences - you might be looking at a Theia-like endgame. Emphasis on the "end".






share|improve this answer











$endgroup$








  • 5




    $begingroup$
    Just wanted to point out this despite it not being in the question. I think the "failure mode" for this solution would be pretty bad. I mean, if I had bought this solution from a world building agency I would want my money back or at least very good insurance for my civilization bundled in the deal.
    $endgroup$
    – Ville Niemi
    2 days ago






  • 1




    $begingroup$
    @VilleNiemi, is there such a real thing as a "world building agency", or is that just a Douglas Adams style joke?
    $endgroup$
    – EveryBitHelps
    2 days ago






  • 1




    $begingroup$
    @EveryBitHelps Obviously building planet scale objects to specification requires highly specialized equipment and expertise. Simple economics requires it is handled by an organization specialized in it.
    $endgroup$
    – Ville Niemi
    yesterday










  • $begingroup$
    @VilleNiemi damn, here I though there where some ppl offering dedicated wb services to help with our geeky hobbies! Besides those of us here on wb.se.
    $endgroup$
    – EveryBitHelps
    yesterday















14












$begingroup$

Yes. That would be a kind of quasi-satellite.



And Earth already has a small one - it's called Cruithne. At perigee, a larger Cruithne might well be visible, always in the same section of the sky.



enter image description here



A larger body would be less stable, but if you only need one thousand years, I think it could work out.



As rightfully pointed out by Ville Niemi, in this context "less stable" might have very, very dire consequences - you might be looking at a Theia-like endgame. Emphasis on the "end".






share|improve this answer











$endgroup$








  • 5




    $begingroup$
    Just wanted to point out this despite it not being in the question. I think the "failure mode" for this solution would be pretty bad. I mean, if I had bought this solution from a world building agency I would want my money back or at least very good insurance for my civilization bundled in the deal.
    $endgroup$
    – Ville Niemi
    2 days ago






  • 1




    $begingroup$
    @VilleNiemi, is there such a real thing as a "world building agency", or is that just a Douglas Adams style joke?
    $endgroup$
    – EveryBitHelps
    2 days ago






  • 1




    $begingroup$
    @EveryBitHelps Obviously building planet scale objects to specification requires highly specialized equipment and expertise. Simple economics requires it is handled by an organization specialized in it.
    $endgroup$
    – Ville Niemi
    yesterday










  • $begingroup$
    @VilleNiemi damn, here I though there where some ppl offering dedicated wb services to help with our geeky hobbies! Besides those of us here on wb.se.
    $endgroup$
    – EveryBitHelps
    yesterday













14












14








14





$begingroup$

Yes. That would be a kind of quasi-satellite.



And Earth already has a small one - it's called Cruithne. At perigee, a larger Cruithne might well be visible, always in the same section of the sky.



enter image description here



A larger body would be less stable, but if you only need one thousand years, I think it could work out.



As rightfully pointed out by Ville Niemi, in this context "less stable" might have very, very dire consequences - you might be looking at a Theia-like endgame. Emphasis on the "end".






share|improve this answer











$endgroup$



Yes. That would be a kind of quasi-satellite.



And Earth already has a small one - it's called Cruithne. At perigee, a larger Cruithne might well be visible, always in the same section of the sky.



enter image description here



A larger body would be less stable, but if you only need one thousand years, I think it could work out.



As rightfully pointed out by Ville Niemi, in this context "less stable" might have very, very dire consequences - you might be looking at a Theia-like endgame. Emphasis on the "end".







share|improve this answer














share|improve this answer



share|improve this answer








edited 2 days ago

























answered 2 days ago









LSerniLSerni

28.9k25293




28.9k25293







  • 5




    $begingroup$
    Just wanted to point out this despite it not being in the question. I think the "failure mode" for this solution would be pretty bad. I mean, if I had bought this solution from a world building agency I would want my money back or at least very good insurance for my civilization bundled in the deal.
    $endgroup$
    – Ville Niemi
    2 days ago






  • 1




    $begingroup$
    @VilleNiemi, is there such a real thing as a "world building agency", or is that just a Douglas Adams style joke?
    $endgroup$
    – EveryBitHelps
    2 days ago






  • 1




    $begingroup$
    @EveryBitHelps Obviously building planet scale objects to specification requires highly specialized equipment and expertise. Simple economics requires it is handled by an organization specialized in it.
    $endgroup$
    – Ville Niemi
    yesterday










  • $begingroup$
    @VilleNiemi damn, here I though there where some ppl offering dedicated wb services to help with our geeky hobbies! Besides those of us here on wb.se.
    $endgroup$
    – EveryBitHelps
    yesterday












  • 5




    $begingroup$
    Just wanted to point out this despite it not being in the question. I think the "failure mode" for this solution would be pretty bad. I mean, if I had bought this solution from a world building agency I would want my money back or at least very good insurance for my civilization bundled in the deal.
    $endgroup$
    – Ville Niemi
    2 days ago






  • 1




    $begingroup$
    @VilleNiemi, is there such a real thing as a "world building agency", or is that just a Douglas Adams style joke?
    $endgroup$
    – EveryBitHelps
    2 days ago






  • 1




    $begingroup$
    @EveryBitHelps Obviously building planet scale objects to specification requires highly specialized equipment and expertise. Simple economics requires it is handled by an organization specialized in it.
    $endgroup$
    – Ville Niemi
    yesterday










  • $begingroup$
    @VilleNiemi damn, here I though there where some ppl offering dedicated wb services to help with our geeky hobbies! Besides those of us here on wb.se.
    $endgroup$
    – EveryBitHelps
    yesterday







5




5




$begingroup$
Just wanted to point out this despite it not being in the question. I think the "failure mode" for this solution would be pretty bad. I mean, if I had bought this solution from a world building agency I would want my money back or at least very good insurance for my civilization bundled in the deal.
$endgroup$
– Ville Niemi
2 days ago




$begingroup$
Just wanted to point out this despite it not being in the question. I think the "failure mode" for this solution would be pretty bad. I mean, if I had bought this solution from a world building agency I would want my money back or at least very good insurance for my civilization bundled in the deal.
$endgroup$
– Ville Niemi
2 days ago




1




1




$begingroup$
@VilleNiemi, is there such a real thing as a "world building agency", or is that just a Douglas Adams style joke?
$endgroup$
– EveryBitHelps
2 days ago




$begingroup$
@VilleNiemi, is there such a real thing as a "world building agency", or is that just a Douglas Adams style joke?
$endgroup$
– EveryBitHelps
2 days ago




1




1




$begingroup$
@EveryBitHelps Obviously building planet scale objects to specification requires highly specialized equipment and expertise. Simple economics requires it is handled by an organization specialized in it.
$endgroup$
– Ville Niemi
yesterday




$begingroup$
@EveryBitHelps Obviously building planet scale objects to specification requires highly specialized equipment and expertise. Simple economics requires it is handled by an organization specialized in it.
$endgroup$
– Ville Niemi
yesterday












$begingroup$
@VilleNiemi damn, here I though there where some ppl offering dedicated wb services to help with our geeky hobbies! Besides those of us here on wb.se.
$endgroup$
– EveryBitHelps
yesterday




$begingroup$
@VilleNiemi damn, here I though there where some ppl offering dedicated wb services to help with our geeky hobbies! Besides those of us here on wb.se.
$endgroup$
– EveryBitHelps
yesterday











11












$begingroup$

A comet could fill this role. Comets are notoriously bright.



comet
https://en.wikipedia.org/wiki/File:Comet_P1_McNaught02_-_23-01-07.jpg



I like the tail but you could have your celestial body be made of something more solid, equally reflective, but not falling apart and leaving the tail.



Comets also have very elliptical orbits and visit infrequently. In this list of periodic comets, 3200 Phaeton has a period of 1.4 years - very short by comet standards.



https://en.wikipedia.org/wiki/3200_Phaethon



3200 phaeton orbit



So: your second moon is a very bright short period comet. That seems plausible.






share|improve this answer









$endgroup$












  • $begingroup$
    This could work, but probably not for very long - a short period comet would have less volatiles, and likely not last for one thousand years (and a large comet would be less stable). But yes, especially if it came from outside the ecliptic, it would be plausible and is a much better solution than a 'quasi-satellite'. ( thenakedscientists.com/articles/questions/… )
    $endgroup$
    – LSerni
    2 days ago















11












$begingroup$

A comet could fill this role. Comets are notoriously bright.



comet
https://en.wikipedia.org/wiki/File:Comet_P1_McNaught02_-_23-01-07.jpg



I like the tail but you could have your celestial body be made of something more solid, equally reflective, but not falling apart and leaving the tail.



Comets also have very elliptical orbits and visit infrequently. In this list of periodic comets, 3200 Phaeton has a period of 1.4 years - very short by comet standards.



https://en.wikipedia.org/wiki/3200_Phaethon



3200 phaeton orbit



So: your second moon is a very bright short period comet. That seems plausible.






share|improve this answer









$endgroup$












  • $begingroup$
    This could work, but probably not for very long - a short period comet would have less volatiles, and likely not last for one thousand years (and a large comet would be less stable). But yes, especially if it came from outside the ecliptic, it would be plausible and is a much better solution than a 'quasi-satellite'. ( thenakedscientists.com/articles/questions/… )
    $endgroup$
    – LSerni
    2 days ago













11












11








11





$begingroup$

A comet could fill this role. Comets are notoriously bright.



comet
https://en.wikipedia.org/wiki/File:Comet_P1_McNaught02_-_23-01-07.jpg



I like the tail but you could have your celestial body be made of something more solid, equally reflective, but not falling apart and leaving the tail.



Comets also have very elliptical orbits and visit infrequently. In this list of periodic comets, 3200 Phaeton has a period of 1.4 years - very short by comet standards.



https://en.wikipedia.org/wiki/3200_Phaethon



3200 phaeton orbit



So: your second moon is a very bright short period comet. That seems plausible.






share|improve this answer









$endgroup$



A comet could fill this role. Comets are notoriously bright.



comet
https://en.wikipedia.org/wiki/File:Comet_P1_McNaught02_-_23-01-07.jpg



I like the tail but you could have your celestial body be made of something more solid, equally reflective, but not falling apart and leaving the tail.



Comets also have very elliptical orbits and visit infrequently. In this list of periodic comets, 3200 Phaeton has a period of 1.4 years - very short by comet standards.



https://en.wikipedia.org/wiki/3200_Phaethon



3200 phaeton orbit



So: your second moon is a very bright short period comet. That seems plausible.







share|improve this answer












share|improve this answer



share|improve this answer










answered 2 days ago









WillkWillk

113k27211476




113k27211476











  • $begingroup$
    This could work, but probably not for very long - a short period comet would have less volatiles, and likely not last for one thousand years (and a large comet would be less stable). But yes, especially if it came from outside the ecliptic, it would be plausible and is a much better solution than a 'quasi-satellite'. ( thenakedscientists.com/articles/questions/… )
    $endgroup$
    – LSerni
    2 days ago
















  • $begingroup$
    This could work, but probably not for very long - a short period comet would have less volatiles, and likely not last for one thousand years (and a large comet would be less stable). But yes, especially if it came from outside the ecliptic, it would be plausible and is a much better solution than a 'quasi-satellite'. ( thenakedscientists.com/articles/questions/… )
    $endgroup$
    – LSerni
    2 days ago















$begingroup$
This could work, but probably not for very long - a short period comet would have less volatiles, and likely not last for one thousand years (and a large comet would be less stable). But yes, especially if it came from outside the ecliptic, it would be plausible and is a much better solution than a 'quasi-satellite'. ( thenakedscientists.com/articles/questions/… )
$endgroup$
– LSerni
2 days ago




$begingroup$
This could work, but probably not for very long - a short period comet would have less volatiles, and likely not last for one thousand years (and a large comet would be less stable). But yes, especially if it came from outside the ecliptic, it would be plausible and is a much better solution than a 'quasi-satellite'. ( thenakedscientists.com/articles/questions/… )
$endgroup$
– LSerni
2 days ago










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