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Forum » SpaceEngine » Science and Astronomy Discussions » Science and Astronomy Questions
Science and Astronomy Questions
JackDoleDate: Tuesday, 31.05.2016, 15:21 | Message # 466
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Quote spacer ()
i guess it will be G2III?

I do not think so. So far as I know, it is definitely 'M'. But that is not accurate enough.

Of course, there are different stages. As far as I know, is the development: G - K - M - D.





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steeljaw354Date: Tuesday, 31.05.2016, 15:28 | Message # 467
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When the hydrogen burns out, the sun will fuse helium at a higher temperature thus getting brighter and larger, then it will fuse carbon, core contracts and sun expands getting brighter and hotter, the sun might go through G-F-A-B-O-K-M-D the sun might be an F class star for a hundred million years, A class for a few million, B class for hundreds of thousands, O class for a few years and then it throw it's layers out once iron in the core forms.
 
spacerDate: Tuesday, 31.05.2016, 15:36 | Message # 468
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steeljaw354, i dont think this is how it works.
see as the sun getting bigger and bigger to red giant...the temp of the star will actully cool down (as far as i know)
the sun surface will be 3000k Because the energy is spread across a larger area. 100 to 1000 bigger than today. if i am correct so it basically like jack said, could be M type as the sun grows.
but lets wait for the professionals to answer happy





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Edited by spacer - Tuesday, 31.05.2016, 15:38
 
steeljaw354Date: Tuesday, 31.05.2016, 15:47 | Message # 469
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Well the core will be very hot so it might blast away the other layers before it turns into a white dwarf.
 
WatsisnameDate: Tuesday, 31.05.2016, 20:02 | Message # 470
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Quote steeljaw354 ()
the sun might go through G-F-A-B-O-K-M-D the sun might be an F class star for a hundred million years, A class for a few million, B class for hundreds of thousands, O class for a few years and then it throw it's layers out once iron in the core forms.


Yeah, that's not how it works. Spectral class refers to the surface temperature, not core temperature. Surface temperature of Sun will increase to ~5900K at most, which is still spectral class G. Then its surface will cool as it expands, dropping to a K. The luminosity class changes as well.

Also, our Sun will never fuse all the way to Iron.





 
OstariskDate: Tuesday, 31.05.2016, 22:26 | Message # 471
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1. Can a star have a set of rings?

2. Can a moon have a moon?






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apenpaapDate: Tuesday, 31.05.2016, 22:33 | Message # 472
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2. Can a moon have a moon?


Theoretically, it's not impossible, but it's very unlikely outside of very young systems. The problem is that most moons, especially the large moons that could theoretically have a sub-moon, get tidal-locked to their planet, always aiming the same face at it. This means the moon rotates very slowly (27 days in the case of our own Moon, for example), and, because the moon's Hill sphere won't be all that large, the sub-moon will almost certainly orbit faster than the moon rotates. Because the sub-moon would orbit faster than it parent rotates, tidal effects wouldn't push its orbit outwards, but instead draw it in. Thus the sub-moon would end up orbiting closer and closer to the moon, and be destroyed in fairly short time.





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spacerDate: Tuesday, 31.05.2016, 22:57 | Message # 473
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Quote Watsisname ()
Spectral class refers to the surface temperature

also to luminosity if i am right? smile





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HarbingerDawnDate: Tuesday, 31.05.2016, 23:05 | Message # 474
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Quote spacer ()
also to luminosity if i am right?

No, that's luminosity class.





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WatsisnameDate: Tuesday, 31.05.2016, 23:53 | Message # 475
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Quote Ostarisk ()
1. Can a star have a set of rings?


You bet. smile





 
SalvoDate: Wednesday, 01.06.2016, 06:24 | Message # 476
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Quote apenpaap ()
the sub-moon would end up orbiting closer and closer to the moon, and be destroyed in fairly short time

...making the planet a wonderful ringed moon. happy





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Edited by Salvo - Wednesday, 01.06.2016, 06:27
 
MosfetDate: Wednesday, 01.06.2016, 12:36 | Message # 477
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Quote Watsisname ()
1. Can a star have a set of rings?

You bet.


This stellar system is not in SE catalog, it could be a nice addition.





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AlekDate: Wednesday, 01.06.2016, 17:47 | Message # 478
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Quote Watsisname ()
Quote Ostarisk ()
1. Can a star have a set of rings?

You bet.


Our sun has two sets of rings too. (Aka the Asteroid Belt and Kuiper Belt)





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JackDoleDate: Wednesday, 01.06.2016, 19:02 | Message # 479
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Mosfet,
Quote Alek ()
This stellar system is not in SE catalog, it could be a nice addition.

The system as such is only a normal binary star system.
And with a trick you can make a ring around the star.



But that does not have much resemblance to the original.
Someone would have to create a nebula that looks like this.



In addition, the rings are only visible when the 'core' of the rings is selected, or orbit lines are turned on. No idea why.

Attachments: 6874387.jpg(239Kb)





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OstariskDate: Wednesday, 01.06.2016, 22:29 | Message # 480
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Quote Alek ()
Our sun has two sets of rings too. (Aka the Asteroid Belt and Kuiper Belt)

I'm looking for broad rings that are clearly visible. (like Saturn's)






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