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ESI of the earth
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| ElectricalEel | Date: Friday, 13.03.2015, 17:51 | Message # 1 |
 Space Tourist
Group: Users
Kuwait
Messages: 33
Status: Offline
| i noticed this today while trying to get a standard to compare planets with,shouldn't the EARTH similarity index of the earth be one?
does this mean there is a planet thats more earth than earth is?
Wikipedia says the esi of the earth is one
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| parameciumkid | Date: Friday, 13.03.2015, 18:01 | Message # 2 |
 Explorer
Group: Users
United States
Messages: 277
Status: Offline
| Wow, that's actually pretty funny. Kinda makes me want to start a CHALLENGE!
Who can be the first to find a planet that's "more Earth than Earth," i.e. has an ESI higher than 0.984?
Intel HD Graphics 4000 ;P
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| pzampella | Date: Friday, 13.03.2015, 18:39 | Message # 3 |
 Space Pilot
Group: Users
Venezuela
Messages: 115
Status: Offline
| Well, that hace been already notice a while ago. However, I think it haven't been explain yet.
People have already found planets with a higher ESI that Earth, you should check on the forum to find it.
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| apenpaap | Date: Friday, 13.03.2015, 19:02 | Message # 4 |
 World Builder
Group: Users
Antarctica
Messages: 1063
Status: Offline
| Earth's elliptic orbit is the problem here. When the Earth gets closer to the Sun, SE considers its temperature to be a little higher, enough to give the ESI a slight dent.
I occasionally stream at http://www.twitch.tv/magistermystax. Sometimes SE, sometimes other games.
Edited by apenpaap - Friday, 13.03.2015, 19:02 |
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| DiscovererOfWorlds | Date: Thursday, 26.03.2015, 19:16 | Message # 5 |
 Space Pilot
Group: Users
Italy
Messages: 120
Status: Offline
| Quote apenpaap (  ) SE considers its temperature to be a little higher, enough to give the ESI a slight dent.
the universe is made to be explored, but no one will ever visit it all
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| Billy_Mayes | Date: Thursday, 26.03.2015, 20:34 | Message # 6 |
 Pioneer
Group: Users
Finland
Messages: 485
Status: Offline
| Quote DiscovererOfWorlds ( ) esi is based on earth.
ESI is based on a constant and fixed temperature. Earth has a tiny elliptical orbit so the temperature varies a little.
AMD Phenom II X4 955 3.2 GHz Quad-Core - AMD Radeon HD 6950 2GB VRAM - 4GB RAM - 1680x1050 75 Hz Samsung screen
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| Aerospacefag | Date: Thursday, 26.03.2015, 21:33 | Message # 7 |
 Pioneer
Group: Users
Russian Federation
Messages: 401
Status: Offline
| I remember that episode form "Mindbridge"(by Holdeman) when protagonist prepared the abstract on the topic of "habitable zone" and also corrected his teacher, because he did not take the greenhouse effect into account - so that actual "habitable zone" is closer to Sun than Earth is and it's only the greenhouse effect that keeps us safe.
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| DiscovererOfWorlds | Date: Saturday, 28.03.2015, 21:15 | Message # 8 |
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Space Pilot
Group: Users
Italy
Messages: 120
Status: Offline
| Quote Aerospacefag ( ) ESI is based on a constant and fixed temperature. Earth has a tiny elliptical orbit so the temperature varies a little.
the universe is made to be explored, but no one will ever visit it all
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| Watsisname | Date: Sunday, 29.03.2015, 08:52 | Message # 9 |
 Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| I'm wondering if there is a language barrier, because I thought apenpaap's and Aerospace's explanations were pretty clear. SE's ESI calculation assumes a constant 288K, which is Earth's average temperature. However, Earth's instantaneous temperature is not a constant 288K, because its orbit is not circular. This therefore reduces the ESI.
Basically, for a planet to have an ESI closer to 1.0, not only must its mass, radius, and temperature be similar, but the temperature must also be more constant, by having a less eccentric orbit.
*Caveat: I have not actually confirmed that this is the real reason for Earth's ESI being less than 1.0, but it sounds reasonable and I am pretty sure that it is correct. If someone wants to test it, try making an Earthlike planet in a custom system, and see what happens when you vary the eccentricity.
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| DiscovererOfWorlds | Date: Sunday, 05.04.2015, 19:15 | Message # 10 |
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Space Pilot
Group: Users
Italy
Messages: 120
Status: Offline
| so it is possible that there are planets with a esi greater than that of the earth?
the universe is made to be explored, but no one will ever visit it all
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| DiscovererOfWorlds | Date: Monday, 06.04.2015, 09:38 | Message # 11 |
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Space Pilot
Group: Users
Italy
Messages: 120
Status: Offline
| watch this planet: has a esi 979! Earth 984
the universe is made to be explored, but no one will ever visit it all
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| pzampella | Date: Tuesday, 07.04.2015, 14:24 | Message # 12 |
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Space Pilot
Group: Users
Venezuela
Messages: 115
Status: Offline
| DiscovererOfWorlds, I can tell that there could be planets more habitable than Earth!
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| Watsisname | Date: Tuesday, 07.04.2015, 21:56 | Message # 13 |
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Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| Quote pzampella ( ) I can tell that there could be planets more habitable than Earth!
ESI is not specifically a measure of habitability, though. It is a measure of how physically similar the planet is to Earth, according to the parameters which are measurable from a distance (size, density, average temperature, etc). Current research suggests that super-Earths (terrestrial planets that are slightly larger than Earth) may be more habitable than our planet. But their calculated ESI would be lower, because of their larger size.
Quote DiscovererOfWorlds ( ) so it is possible that there are planets with a esi greater than that of the earth?
In Space Engine, yes. Apparently some people have already found examples of them. 
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