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General suggestions
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| JackDole | Date: Saturday, 14.11.2015, 23:18 | Message # 646 |
 Star Engineer
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Germany
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| Quote Watsisname (  ) There is a maximum size of a rocky planet, placed by physics. This is ~4 Earth radii. At that point, adding more rock makes it smaller.
What if the planet has a lower density than the Earth? In the early universe, when there was not as many heavy elements, such a planet could have formed. He would probably not meet the definition of a rocky planets, but he could have a solid surface, and would be no ice or gas giant.
That's the kind of planet I need. For Jack Vance's 'Big Planet' and Robert Silverberg's 'Majipoor'. 
Don't forget to look here.
Edited by JackDole - Saturday, 14.11.2015, 23:20 |
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| Alek | Date: Saturday, 14.11.2015, 23:48 | Message # 647 |
 Pioneer
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United States
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| Quote Watsisname ( ) Universe Sandbox is not realistic in letting you create 1 Jupiter mass rocky planets unless you choose to disregard natural planet formation processes.
But I said with the "random exoplanet"button, so it seems that a few have been actually discovered, since US^2 only uses it's database when using the "random exoplanet" button :-/
Quote JackDole ( ) when there was not as many heavy elements,
Yeah...Hydrogen was even more common then, meaning gas giants would have formed even more easily.
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
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| Watsisname | Date: Sunday, 15.11.2015, 00:09 | Message # 648 |
 Galaxy Architect
Group: Global Moderators
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| JackDole:
Sorry, it just doesn't work out that way. Check the paper I linked a few posts ago, and particularly see Fig 4. (This is one of my favorite plots in the planetary sciences.)  The authors derive the mass-radius relationship for solid planets, where density decreases vertically up the scale (same mass in larger volume).
Let's start by considering a very high density planet made purely of iron. How big can it get? From the plot, we see the maximum size it can be is about 2.5 Earth radii. Beyond that, adding more mass shrinks it.
But what if we start building planets with a less-dense mixture of materials? Say we replace more and more of the iron with things like silicate rock, or water. This decreases the density, which increases the size for a given mass. Indeed, the plot confirms this. The plot also shows that these lower-density planets can attain a larger size before gravitational contraction shrinks them down again.
So, what is the lowest density world you can build which has a solid surface, and how big can you make it? This would be a water world (or water-ice world). From the plot, the maximum possible size of a water-world is between 4 and 5 earth radii, which would again weigh in at about 1000 Earth masses. This is totally unrealistic, because it still only takes 10 Earth masses to start gathering the hydrogen and helium that would be around in the early universe. Such large solid planets would never be expected to form in our universe, no matter what era we look at.
The largest planet with a solid surface you can possibly have which doesn't surpass that 10 Earth mass terrestrial-->ice giant transition, is a ~2.4 Earth radius water world. If you go less dense than that, then you are requiring that the planet be made up of more and more hydrogen and helium, and it really doesn't qualify as a solid planet anymore (let alone rocky).
This is why SpaceEngine does not create terrestrial worlds larger than ~2.4 Earth radii. It just doesn't happen in nature. And no matter how you might change the planet formation process to avoid the ice-giant transition, you still can't make solid planets arbitrarily large. The laws of physics hold you to no more than ~4-5 Earth radii.
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| Watsisname | Date: Sunday, 15.11.2015, 00:41 | Message # 649 |
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Galaxy Architect
Group: Global Moderators
United States
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| Quote Alek ( ) But I said with the "random exoplanet"button, so it seems that a few have been actually discovered, since US^2 only uses it's database when using the "random exoplanet" button :-/
They are not rocky exoplanets.
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| JackDole | Date: Sunday, 15.11.2015, 00:50 | Message # 650 |
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Star Engineer
Group: Local Moderators
Germany
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| Quote Watsisname ( ) Sorry, it just doesn't work out that way
So no 'Big Planet', no 'Majipoor'?  What a disappointment! 
Don't forget to look here.
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| Watsisname | Date: Sunday, 15.11.2015, 00:52 | Message # 651 |
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Galaxy Architect
Group: Global Moderators
United States
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| I'm sorry. I wish I could have real life ponies made of diamonds, damn the laws of biochemistry.
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| JackDole | Date: Sunday, 15.11.2015, 01:05 | Message # 652 |
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Star Engineer
Group: Local Moderators
Germany
Messages: 1742
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| Quote Watsisname ( ) ponies made of diamonds
That would be far too dangerous! Constantly someone would try to steal them.
Don't forget to look here.
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| HarbingerDawn | Date: Sunday, 15.11.2015, 09:35 | Message # 653 |
 Cosmic Curator
Group: Administrators
United States
Messages: 8717
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| Quote Watsisname ( ) I wish I could have real life ponies made of diamonds
All forum users, please read this!
My SE mods and addons
Phenom II X6 1090T 3.2 GHz, 16 GB DDR3 RAM, GTX 970 3584 MB VRAM
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| SpaceEngineer | Date: Monday, 16.11.2015, 17:48 | Message # 654 |
 Author of Space Engine
Group: Administrators
Russian Federation
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| In addition to what Watsisname said, you can't have a purely metallic or purely water planet. This is impossible in natural planet-forming process, because it is taking deal with entire Periodic table. You can't have a part of a protoplanet nebula made purely of iron, when a part made purely of basalt particles, when purely of water ice. Everything will be intermixed, abundance of each material will change gradually with distance to sun.
Quote OMGspace_engine ( ) For the Water planets, I mean not a full transparence, but a transparece in the planet "borders", imagine if you was looking for the star from behind the planet, the light, instead of a full cut in the luminosity, will suffer a "fade-out" to the core of the planet(I think it was not much clear, but is the best I can think to explain )
Impossible. Did you ever seen the Sun shining through the ocean few minutes after sunset?
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| Bells_Theorem | Date: Monday, 16.11.2015, 19:51 | Message # 655 |
 Explorer
Group: Users
United States
Messages: 188
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| Are cloud shadows planned for in future updates? Would they be difficult to implement?
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| HarbingerDawn | Date: Tuesday, 17.11.2015, 00:48 | Message # 656 |
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Cosmic Curator
Group: Administrators
United States
Messages: 8717
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| Quote Bells_Theorem ( ) Are cloud shadows planned for in future updates? Would they be difficult to implement?
Yes and probably.
All forum users, please read this!
My SE mods and addons
Phenom II X6 1090T 3.2 GHz, 16 GB DDR3 RAM, GTX 970 3584 MB VRAM
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| BKunze | Date: Friday, 20.11.2015, 06:17 | Message # 657 |
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Observer
Group: Newbies
Canada
Messages: 1
Status: Offline
| Are tidal effects planned in the near future, or will that most likely be further down the road, if at all?
Edited by BKunze - Friday, 20.11.2015, 06:18 |
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| n0b0dy | Date: Friday, 20.11.2015, 06:53 | Message # 658 |
 Explorer
Group: Users
Pirate
Messages: 297
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| Quote BKunze ( ) Are tidal effects planned in the near future, or will that most likely be further down the road, if at all?
I doubt they will be implemented in the near future. Most likely it will be further down or not possible at all (hopefully not).
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| Zefnoly | Date: Friday, 20.11.2015, 22:24 | Message # 659 |
 Space Tourist
Group: Users
Pirate
Messages: 38
Status: Offline
| What about a system generator where you can like choose a place in a galaxy you find. then open it up to generate a system at a choosen spot. maybe with help of cordinates or location of camera. Then you can insert parameters for the system. What kind of star. how many planets? what kind of moons/planets they will have and the base color and if they will have life or not etc...
EDIT: I'm not talking about the star browser. I'm talking about a tool to generate a system with help of parameters if you don't find what you want
A creature from a planet found far on the other side of Milkyway, found on a planet orbiting a gas giant.
Edited by Zefnoly - Friday, 20.11.2015, 23:00 |
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| GlenStevensTD | Date: Sunday, 29.11.2015, 19:48 | Message # 660 |
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Observer
Group: Banned
Belgium
Messages: 11
Status: Offline
| What about subdwarfs and subgiants will be procedurally generated. Subgiants and subdwarfs will less common than main sequence
Irrregular and Lenticular galaxies:
Blue-White and Yellow subdwarfs
Blue-White subgiants
Sprial galaxies:
White-Yellow-Orange-Red subdwarfs
Blue-White-Yellow-Orange-Red subgiants
Elliptical galaxies:
Red-Yellow-Orange subdwarfs
Red-Orange subgiants
Edited by GlenStevensTD - Sunday, 29.11.2015, 19:48 |
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