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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
neutronium76Date: Monday, 23.01.2012, 22:52 | Message # 31
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Quote (Chris)
I think we need to add some kind of weighting value to each parameter of the formula posted earlier in this thread.
So far the results i've been getting are rather disappointing.
The most habitable planet i've seen listed on this forum is RS 1137-1-5-26728-4 6. This planet scores around 40% and I didn't even bother taking into account the presence of a moon. The formula is rather punishing when you apply it on the property of the mass of a planet. The range of planets that should score higher results should be wider in my opinion.
Looking at the mass parameter alone, Mars scores 0,39.
That in itself is not unacceptable. But if you compare with the results you get when you apply the formula on the temperature property, almost all of the planets other users have posted on this forum, scores +0,90. Many of these planets would by extremely hot or cold for us.

We should define a range of acceptable values for each planetary property, and adjust the formula, perhabs using a weighting value, to have the fomula go off the chart, when you fill in values outside that defined range


I think the 3 most important parameters should be:
1. Gravity (mass/volume depended)
2. Temperature
3. Atmospheric Pressure

There should be minimum deviation from earth's values for these 3 parameters. Advanced Life i.e. complex life forms - not just bacteria and amoeba, has very low tolerance in variations of these parameters. There must be a constant which can be applied in the equation that will increase the impact these parametrs have on the similarity index.





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SpaceEngineerDate: Tuesday, 24.01.2012, 00:18 | Message # 32
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Maybe in next release I include calculation of Earth similarity index based on some equation. It will be displayed in planet info table. I don't like the standart ESI formula - it has extra data. Raduis and surface gravity is equivalent to radius and escape velocity or radius and bulk density. I prefer atmosphere pressure instead of bulk density, and surface gravity instead of escape velocity. Of course, the parameters were chosen for real exoplanets because we have no data about atmospheres, but temperature together with escape velocity gives an idea of what gases can be hold by planet.

http://phl.upr.edu/projects/earth-similarity-index-esi

*





 
neutronium76Date: Tuesday, 24.01.2012, 08:17 | Message # 33
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Quote (neutronium76)
Maybe in next release I include calculation of Earth similarity index based on some equation. It will be displayed in planet info table. I don't like the standart ESI formula - it has extra data. Raduis and surface gravity is equivalent to radius and escape velocity or radius and bulk density. I prefer atmosphere pressure instead of bulk density, and surface gravity instead of escape velocity. Of course, the parameters were chosen for real exoplanets because we have no data about atmospheres, but temperature together with escape velocity gives an idea of what gases can be hold by planet.


That would be great idea! Also it can be pushed even further - let me explain:
The ship could have a short of scan device /telescope with spectrometer) which would allow for scanning of nearby system e.g scan in all directions within an "x" light year radious for planets with ESI 0.9 or higher. If there is an economic system ala Elite/Freelancer/Evochron etc, the more money you earn from your adventures, the better scanners you will be able to equip your ship with, so that you can scan 2x light years or more radius and with more accuracy wink

*





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SpaceEngineerDate: Tuesday, 24.01.2012, 12:39 | Message # 34
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Quote (neutronium76)
The ship could have a short of scan device /telescope with spectrometer) which would allow for scanning of nearby system e.g scan in all directions within an "x" light year radious for planets with ESI 0.9 or higher. If there is an economic system ala Elite/Freelancer/Evochron etc, the more money you earn from your adventures, the better scanners you will be able to equip your ship with, so that you can scan 2x light years or more radius and with more accuracy


This breaks the gameplay. If anyone has such "scanners", nobody will take a journey. Any interstellar flight will be just a business trip. And I don't believe that it is possible to detect life from 2 ly. You should take a year of observation on modern telescopes to detect a few spectral lines from a planet. To see Earth-sized planet disk from 2 ly as image with 10 pixels radius, you should use the telescope with an aperture of 10 km! Anyway, observation takes a lot of time. It is much faster to fly to that system and visit every planet.

*





 
neutronium76Date: Tuesday, 24.01.2012, 20:32 | Message # 35
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Quote (SpaceEngineer)
This breaks the gameplay. If anyone has such "scanners", nobody will take a journey. Any interstellar flight will be just a business trip. And I don't believe that it is possible to detect life from 2 ly. You should take a year of observation on modern telescopes to detect a few spectral lines from a planet. To see Earth-sized planet disk from 2 ly as image with 10 pixels radius, you should use the telescope with an aperture of 10 km! Anyway, observation takes a lot of time. It is much faster to fly to that system and visit every planet


ESI does not guarantee that the planet will have life. It is just an indicator of life supporting ability. If anyone has such scanners, they will avoid visiting systems that contain only gas and ice giant and small selenas and therefore they will have more time to focus on interesting systems with terra planets. But this is a gameplay topic and I am going off topic here... Anyway back to the quest for new earth cool





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Edited by neutronium76 - Tuesday, 24.01.2012, 20:35
 
TalynDate: Thursday, 19.04.2012, 18:28 | Message # 36
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Is this challenge still on?

I have Found a good candidate on the edge of the galaxy, but I think there is something wrong with my 'sensors' because a planet on this orbit should never be this cold. The presence of liquid water confirms that my sensors need a "level 1 diagnostics" smile






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DevonXDate: Thursday, 19.04.2012, 21:51 | Message # 37
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Quote (Talyn)
Is this challenge still on?

I have Found a good candidate on the edge of the galaxy, but I think there is something wrong with my 'sensors' because a planet on this orbit should never be this cold. The presence of liquid water confirms that my sensors need a "level 1 diagnostics" smile


Wow nice
 
TalynDate: Thursday, 19.04.2012, 22:11 | Message # 38
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I would HATE having to work on this planet though, with a 184+ hour "day" biggrin
On the PLUS side, there are no seasons, as the axial tilt is 0º smile





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architeuthisDate: Saturday, 02.06.2012, 03:52 | Message # 39
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Quote (neutronium76)
I think the 3 most important parameters should be:
1. Gravity (mass/volume depended)
2. Temperature
3. Atmospheric Pressure

There should be minimum deviation from earth's values for these 3 parameters. Advanced Life i.e. complex life forms - not just bacteria and amoeba, has very low tolerance in variations of these parameters. There must be a constant which can be applied in the equation that will increase the impact these parametrs have on the similarity index.

What you propose isn't so much an Earth similarity index per se so much as a human habitability index. When it comes to knowing what sorts of parameters favor advanced life, it is difficult to know for sure. As humans, and knowing of no other advanced life forms beyond the Earth we have to deal with basically the mother of all sampling bias when we try to guess at such things. Unless by advanced you mean multicellular, in which case there are all kinds of extremophiles on Earth that live at pressures and temperatures far beyond what is possible for humans.

That said I think you (and also chris) are definitely right. I've seen terras with hundreds of atmospheres pressure at surface level. Assuming we won't need pressure suits to go outside, or some kind of elaborate fluid immersion to keep us from being crushed by acceleration of gravity, then many of these life bearing terras would have a human habitability score of zero.


Edited by architeuthis - Saturday, 02.06.2012, 04:00
 
neutronium76Date: Saturday, 02.06.2012, 18:31 | Message # 40
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Earth similarity index = human habitability index in any case dry unless there are humans able to survive without a spacesuit in Venus biggrin




PC1:Core i7 970@3.34GHz, 6 cores/12 threads, 12GB DDR3 RAM@1.34GHz, 2x(SLI) GTX-580 GPUs 3GB VRAM(GDDR5)@1GHz, OS:Win7x64SP1
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architeuthisDate: Monday, 04.06.2012, 03:29 | Message # 41
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This candidate looks not so bad. Fairly short days but we could live there:D

Attachments: 7437167.jpg(220Kb)


Edited by architeuthis - Monday, 04.06.2012, 03:31
 
HarbingerDawnDate: Monday, 04.06.2012, 06:27 | Message # 42
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Quote (architeuthis)
This candidate looks not so bad. Fairly short days but we could live there:D

Looks pretty nice overall. A little hot though. The only big drawback is that it's laying on its side like Uranus. The seasons would be unbearably extreme.





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TalynDate: Monday, 04.06.2012, 14:24 | Message # 43
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If you were living on the poles you would get Half year of eternal sun + half year of eternal night and feel a bit heavy wink

Other than that, very close to our home.

Keep searching, the earth twin is there smile





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neutronium76Date: Tuesday, 05.06.2012, 20:23 | Message # 44
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Quote (architeuthis)
This candidate looks not so bad. Fairly short days but we could live there:D


Galaxy 5303 hmm this is not in our galaxy. So it doesn't qualify - sorry sad .





PC1:Core i7 970@3.34GHz, 6 cores/12 threads, 12GB DDR3 RAM@1.34GHz, 2x(SLI) GTX-580 GPUs 3GB VRAM(GDDR5)@1GHz, OS:Win7x64SP1
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neutronium76Date: Tuesday, 05.06.2012, 20:41 | Message # 45
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I thi nk the algorithm/code that is responsible for creating terras and terras with life in SE should be changed to more pessimistic values. Right now we've come across so many earth like planets in SE. It should be far more rare in my opinion... Especially systems with multiple terras with life... Anyway this is of topic and moderators may move it to suggestion section wink




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