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Forum » SpaceEngine » Space Journeys » Challenge: The Quest for Earth's Twin (Find the closest possible match to our home planet)
Challenge: The Quest for Earth's Twin
Which Terra is as similar as possible to Earth?
1.earth match 90-100%[ 44 ][78.57%]
2.earth match 80-90%[ 10 ][17.86%]
3.earth match 70-80%[ 6 ][10.71%]
4.earth match 60-70%[ 2 ][3.57%]
5.earth match 50-60%[ 3 ][5.36%]
6.earth match 40-50%[ 3 ][5.36%]
7.earth match 30-40%[ 4 ][7.14%]
8.earth match 20-30%[ 2 ][3.57%]
9.earth match 10-20%[ 2 ][3.57%]
10.earth match 0-10%[ 5 ][8.93%]
Poll expiry date: Tuesday, 23.11.2021, 09:34
Answers total: 56
smjjamesDate: Monday, 03.09.2012, 15:32 | Message # 61
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Quote (HarbingerDawn)
Quote (smjjames)
This one comes pretty close, and it is in the Milky Way.

There are a lot of differences. The size is extremely different, much lower surface gravity, atmosphere is denser, and climate is colder. The only similarities it has to Earth are blue air and the rotation period.


I did say Earth-like, not Earth twin, and we have that percentage match above.

How about this one? It has slightly lower gravity despite being twice the mass (more water I guess?), a mild axial tilt, slightly thicker atmosphere (which we can adapt to) and yes I know its colder.

I did notice one thing that might be an issue, this planet seems to have been hit by large asteroids frequently and in fact, I took a closer look at the system and there is a gas giant in the next orbit out and a large asteroid belt just beyond that.

Attachments: 7929676.jpg(233Kb)





 
TalynDate: Monday, 03.09.2012, 17:30 | Message # 62
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The mass and size are not a big problem and I guess the planet must be in orbit of a k Star, to be that close and still fresh.

The only problem I see with this planet is the axial tilt because at 56º I suspect the seasons would be extreme dry





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smjjamesDate: Monday, 03.09.2012, 17:53 | Message # 63
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Quote (Talyn)
The mass and size are not a big problem and I guess the planet must be in orbit of a k Star, to be that close and still fresh.

The only problem I see with this planet is the axial tilt because at 56º I suspect the seasons would be extreme dry


I think it was around a K type star, and what do you mean by still fresh? Anyways, I'm looking at any planet that has life on it, regardless of the primaries spectral type, unless of course the planet is tidally locked.

Also, look closer at the axial tilt, it says 0º56, not 56º.





 
TalynDate: Monday, 03.09.2012, 18:03 | Message # 64
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Quote (smjjames)
what do you mean by still fresh?

Look at the temperature, 267ºK is just a bit below 0ºC so it should be a bit colder than Earth with an average 15ºC or 288ºK

Quote (smjjames)
Also, look closer at the axial tilt, it says 0º56, not 56º.


Sorry, my bad, that makes it almost PERFECT. A super-earth with no season changes :O. If not for the sub-zero average temperature that is closedeyes





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Edited by Talyn - Monday, 03.09.2012, 18:36
 
HarbingerDawnDate: Monday, 03.09.2012, 18:14 | Message # 65
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Quote (Talyn)
286ºK

288K smile





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TalynDate: Monday, 03.09.2012, 18:36 | Message # 66
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Sorry for the Typo :P

I will Edit my previous post though smile





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smjjamesDate: Monday, 03.09.2012, 20:08 | Message # 67
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I've got a question, do terran moons of gas giants count?




 
neutronium76Date: Monday, 03.09.2012, 22:17 | Message # 68
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Quote (smjjames)
I've got a question, do terran moons of gas giants count?


When I started the contest, terran moons of gas giants would have been excluded: The radiation belt and the very strong Van-Allen zones of the gas giant would most definitely fry any kind of life on such a world. But hey - lets not be that strict - this is for fun after all smile so through in your findings! (We are an adaptable species after all as Sagan said once wink )





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smjjamesDate: Monday, 03.09.2012, 22:31 | Message # 69
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Good point, although a large enough planet with a magnetic field might be able to protect life on it.




 
smjjamesDate: Tuesday, 04.09.2012, 17:41 | Message # 70
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Not sure how strict you guys are on double posting, but I just felt like that it would be better to make a new post.

Some images from my journeys while looking for earth twins:

I forgot to take a picture of it, but yesterday I found an oceania that could pass for an Earth sibling, if it had land. However, being an oceania, it doesn't qualify anyway.

I know this one isn't particularily Earth-like, but I've gotta admit that based on the image alone, I could have taken it for an Earthlike world, and it IS a beautiful looking planet. One of the more beautiful terras with life that I've seen.


This is why I was asking about whether moons of gas giants count. The planetary conditions look like something we can adapt to (maybe with a bit of genetic engineering), but not so sure about the 8 earth day long rotation period.


This one is probably more of an Earth cousin because of the lighter gravity, but the atmosphere is slightly thinner and its slightly cooler. It might resemble Earth under ice age conditions actually.


This one comes CLOSE in terms of gravity, day length, and atmosphere. Alhough with half the mass and slightly higher than Earth gravity, not even sure how that works planetary composition wise, but it must be really dense and/or have a large core.

There are three key differences though, the first, as you may have noticed, is that it's around a red dwarf star, second is that it's much colder, and the third is that the other planet it's orbiting has an orbital period of 53 days.


Nix the previous one as an Earth Twin candidate as I've found a much better one. The longer year is due to the fact that it's around an F3 V star. Despite having a moon a little bit larger than Mars (and thus more extreme tides), it would rank high on planetary habitability. It's not even a billion years old, so I don't know if oxygen levels would be at levels which we can survive in. The stars brightness shouldn't be a problem since any colonists would adapt in some way.

Some of the planets terrain.

Attachments: 0672411.jpg(308Kb) · 2655994.jpg(202Kb) · 2835636.jpg(227Kb) · 6419592.jpg(261Kb) · 7516088.jpg(269Kb) · 3643911.jpg(144Kb)







Edited by smjjames - Wednesday, 05.09.2012, 15:55
 
neutronium76Date: Thursday, 06.09.2012, 22:23 | Message # 71
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I think I'll settle down in this one for a few scrennshots:



A nice match. Not perfect, but close wink

Attachments: 3318437.jpg(48Kb)





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Edited by neutronium76 - Thursday, 06.09.2012, 22:26
 
smjjamesDate: Wednesday, 19.09.2012, 21:22 | Message # 72
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*FACEDESK*

Dangit! I had a terran that was very close to being an earth twin with 23 hour rotation around a terran planet which itself has an about 311 day or so orbit around its primary, the gravity was slightly higher than earth and the atmospheric pressure was slightly lower and the temp was 303 K or so, but somehow I failed to take a screenshot and while I did make a location, i somehow lost it!!!! *FACEDESKITY* It didn't look like it's atmosphere was an oxygen atmosphere though as it was reddish.

Also, I can't get back to it through the log.......

I think there may have been other screenshots, but I don't think a crash would erase them........

It'll probably be somewhat easier to find an earth twin once the next update tones down the extreme thickness of terran planet atmospheres and possibly fixes the often wild axis tilts.







Edited by smjjames - Wednesday, 19.09.2012, 21:38
 
smjjamesDate: Monday, 08.10.2012, 00:59 | Message # 73
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Found one that is very Earthlike. Slightly heavier gravity and slightly denser atmosphere, similarily mild axial tilt, not too short day length. The atnosphere is a whitish, almost blue-grey color, so it most likely is some kind of oxygen mix. Part of that may be because it's primary is a K5 main sequence star.

I know it's 11 degrees kelvin colder than Earth, but I don't see that as an issue.


Place "Earthlike world"
{
Body "RS 8403-397-9-53804464-30 4"
Parent ""
Pos (3.727099744826358e-010, -2.676795725180259e-010, -9.959808395772554e-011)
Rot (0.3671759639671818, -0.2471634414592366, 0.7382176804265902, -0.5090448909441898)
Date "2012.10.08 15:00:45.74"
Vel 6.5799144e-011
Mode 1
}

Attachments: 7215046.jpg(272Kb)







Edited by smjjames - Monday, 08.10.2012, 01:00
 
smjjamesDate: Tuesday, 09.10.2012, 16:27 | Message # 74
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I've got one that could ALMOST pass for an Earth twin, only problem as you can see, it's in another galaxy (two actually) some 145 million light years from Earth.

Attachments: 6227015.jpg(188Kb)





 
SalvoDate: Tuesday, 09.10.2012, 21:16 | Message # 75
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neutronium76, wow! Awesome, a good candidate for Earth twin, the only flaw is that the star looks M-K class, because planet is yellowish smile




The universe is not required to be in perfect harmony with human ambition.

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