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All stars have planets?
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| lowmal | Date: Tuesday, 11.09.2012, 20:31 | Message # 1 |
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Observer
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| First off, I want to thank those that made this engine. It's absolutely fantastic and does a great job showing the scale of the universe. I'm having a lot of fun with it.
One question I have is whenever I click on a star, it is guaranteed to have planets. Shouldn't only ~1/3 of stars have planets, or is there a setting that decreases planetary system frequency?
Edited by lowmal - Tuesday, 11.09.2012, 20:33 |
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| smjjames | Date: Tuesday, 11.09.2012, 20:43 | Message # 2 |
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| Theres a couple of catalog stars (Sirius A and B and a supergiant star over by the LMC for examples) and a few procedural ones (the bright blue main sequence stars are the only procedural stars that I've seen without planets) that don't have procedural planets.
White dwarfs and procedural pulsars don't seem to generate planets either.
So, 99.99% of the stars will have planets. For the actual real world number of stars having planets, they may turn out to be more common than ~ 1/3 of all stars.
There isn't any setting which regulates the possibility of procedural stars having planets, but you can turn off procedural stars and procedural planets if you'd like.
For the scientific bit, I don't know, we've found pulsar planets, so maybe all but the really big stars or ones that blow away the dust disk before planets can form would have planets.
Edited by smjjames - Tuesday, 11.09.2012, 20:50 |
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| HarbingerDawn | Date: Tuesday, 11.09.2012, 21:28 | Message # 3 |
 Cosmic Curator
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| Hello lowmal, and welcome to the forum. Please take a moment to read the forum rules.
All procedural stars in SpaceEngine will have planetary systems. That's just the way it's coded. Maybe in the future this will change. But in reality it is thought that far more than 1/3 of star systems have planets. Most are suspected to have them.
Quote (smjjames) so maybe all but the really big stars or ones that blow away the dust disk before planets can form would have planets
Pulsars form from supernova explosions, so either the planets had already formed around the massive progenitor star, or they formed from debris from the supernova
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| smjjames | Date: Tuesday, 11.09.2012, 22:33 | Message # 4 |
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| Quote (HarbingerDawn) Quote (smjjames)
so maybe all but the really big stars or ones that blow away the dust disk before planets can form would have planets
Pulsars form from supernova explosions, so either the planets had already formed around the massive progenitor star, or they formed from debris from the supernova
I was referring to protostars when i said that, should have been clearer there, and the really big stars are like supergiants and hypergiants.
For the Pulsars, yeah, one theory is that some are the surviving cores of gas giants.
Edited by smjjames - Tuesday, 11.09.2012, 22:34 |
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| lowmal | Date: Wednesday, 12.09.2012, 01:28 | Message # 5 |
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Observer
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| Ok thanks guys. I also see that I was wrong about the ratio of stars w/ solar systems to loners. I remember hearing about the Drake equation and they put the estimate at around 20-40% at the time.
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| HarbingerDawn | Date: Wednesday, 12.09.2012, 01:34 | Message # 6 |
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| Quote (lowmal) I remember hearing about the Drake equation and they put the estimate at around 20-40% at the time
The Drake equation has no specific numbers associated with it, that's one of its most beautiful aspects. You can input any numbers you want. For example, in Carl Sagan's "Cosmos", he used 25%, but since that was for individual stars and not star systems, then it corresponds to something like 60% of star systems. Given the data that we are gathering today, it is probably safe to say that the number is not less than this, and may well be greater.
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| smjjames | Date: Wednesday, 12.09.2012, 02:36 | Message # 7 |
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| If the amount of 'life bearing*' planets that we find in SE says anything, then there might even be a handful of systems with life within 100 parsecs.
Still, even if we take what SE does as a bit over optimistic, there are probably 50 million worlds in our galaxy alone that could potentially support life (and that's just the Terras!). Sure life bearing planets may be relatively rare, but that 'rare' number is still a HUGE number.
*What SE labels as having life, and the environment is often very different from Earths. Plus it doesn't always quite fit what might actually support life, at least life as we know it anyway.
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| Sharpshooter | Date: Sunday, 16.09.2012, 14:46 | Message # 8 |
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| I think that before the major latest patch update planets had smaller chances to appear near stars but now nearly every star has some
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| HarbingerDawn | Date: Sunday, 16.09.2012, 15:03 | Message # 9 |
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| Quote (Sharpshooter) I think that before the major latest patch update planets had smaller chances to appear near stars but now nearly every star has some
No, in every SpaceEngine version all procedural stars had planets.
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| Talyn | Date: Sunday, 16.09.2012, 21:38 | Message # 10 |
 Explorer
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| Thats funny, unfortunatelly I only noticed this thread now, otherwise I would have taken a screenshot of a star I've found yesterday without planets. I found it odd but I dismissed it as a normal feature of Space Engine
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| HarbingerDawn | Date: Sunday, 16.09.2012, 21:41 | Message # 11 |
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| Quote (Talyn) Thats funny, unfortunatelly I only noticed this thread now, otherwise I would have taken a screenshot of a star I've found yesterday without planets. I found it odd but I dismissed it as a normal feature of Space Engine
Was it a procedural star or a catalog star?
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| smjjames | Date: Sunday, 16.09.2012, 22:08 | Message # 12 |
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| Quote (HarbingerDawn) Quote (Talyn)
Thats funny, unfortunatelly I only noticed this thread now, otherwise I would have taken a screenshot of a star I've found yesterday without planets. I found it odd but I dismissed it as a normal feature of Space Engine
Was it a procedural star or a catalog star?
There are some catalog stars that don't get planets generated for some reason (usually those that are in multiples, such as Sirius and its companions). However, I've seen a few of the rare bright blue main sequence stars that were without planets, and all of them were binaries I think. At least the system said there were two planets, but I couldn't find any, even in the system browser. Those few might be a glitch with bright blue stars in binaries because they are so hot or something.
The procedural planet generation doesn't seem to work for white dwarfs and neutron stars though.
Edited by smjjames - Sunday, 16.09.2012, 22:10 |
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| Talyn | Date: Sunday, 16.09.2012, 22:10 | Message # 13 |
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Explorer
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| I'm quite sure it was a procedural star, because I was exploring a procedural galaxy 
PC: Intel Core2Duo E6850 @ 3.00 GHz & 4GB DDR3 @ 1333 - NVIDIA GeForce 8800 GTS with 640 MB VRAM
Laptop: Intel Core2Duo T9400 @ 2.53 GHz & 4 GB DDR @ 1066 - NVIDIA GeForce 9600M GT
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| smjjames | Date: Sunday, 16.09.2012, 22:11 | Message # 14 |
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| Talyn, what color was the star?
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| Talyn | Date: Sunday, 16.09.2012, 22:36 | Message # 15 |
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Explorer
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| I think it was a class F or G star, but I may be wrong :S
I really didn't pay much atention and quickly dismissed it as a normal feature of Space Engine
PC: Intel Core2Duo E6850 @ 3.00 GHz & 4GB DDR3 @ 1333 - NVIDIA GeForce 8800 GTS with 640 MB VRAM
Laptop: Intel Core2Duo T9400 @ 2.53 GHz & 4 GB DDR @ 1066 - NVIDIA GeForce 9600M GT
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