| Speculative biology is simultaneously a science and form of art in which one speculates on the possibilities of life and evolution. What could the world look like if dinosaurs had never gone extinct? What could alien lifeforms look like? What kinds of plants and animals might exist in the far future? These questions and more are tackled by speculative biologists, and the Speculative Evolution welcomes all relevant ideas, inquiries, and world-building projects alike. With a member base comprising users from across the world, our community is the largest and longest-running place of gathering for speculative biologists on the web. While unregistered users are able to browse the forum on a basic level, registering an account provides additional forum access not visible to guests as well as the ability to join in discussions and contribute yourself! Registration is free and instantaneous. Join our community today! |
| Creating a star system "Netherlands" | |
|---|---|
| Topic Started: Aug 7 2017, 05:31 AM (287 Views) | |
| Victorbrine | Aug 7 2017, 05:31 AM Post #1 |
|
Adult
![]() ![]() ![]() ![]() ![]() ![]()
|
I think this is the right place to ask this but... I want to create a story involving dragons living on an Earth like planets orbiting around a black hole. This black hole has an accretion disc that is 12022000 kilometers in radius (approximation). But the idea is that the planet orbits close to the edge of it, making it between 6 and 5 million kilometers from the center of the Black Hole. The planet is slightly less massive than earth but it is still a relatively Earth sized planet (maybe 0.98 Earth radius) but it doesn't have any moon (I might add one if necessary). I want to know if it's plausible to have a planet with life at this distance of the black. Reason is because I want this planet tohave awesome "sunrise" and "sunsets" (or Dutchrise and Dutchsets because the name of the black hole is Netherlands). I don't think accretion discs are that hot and emit a lot of energy, unlike normal stars, so the planet should be close to the disc (according to me). Also I don't really take in account the gamma rays produced by the black hole. Is it also possible for multicellular life to evolve on such a planet? Do you guys have better parameters for such a planet? I also simulated this system in Space Engine, hence why all those specific numbers. (Now I know this could be in the topic "Questions that don't need their own topic" but I want this as an independent topic since this topic will be where I will kind of "build" my system since I need some of your help to build this star system, planet etc. So this is why it's an independent and different topic.) |
|
“There's a tree," Starflight said, jumping to his feet. "In the forest." "No way," Glory said. "A tree in the forest?” "Ce corps qui s'appelait et qui s'appelle encore le saint empire romain n'était en aucune manière ni saint, ni romain, ni empire." -Voltaire "So if you wake up in the morning and it's a particularly beautiful day you'll know we made it." -Capa "One of those capsules hit a wing." Victor said. "Had to do an emergency landing." He pointed to a crumpled plane a couple dozen meters behind him and shrugged. "Not my most elegant landing." -me in Flisch's story "Spec Evo: Void Entry" (Act 3) "but by rule 34 of the multiverse, if it exists, there’s a world full of it." -Tet "I must ask you to leave now." -Everyone (not realy though) in Flisch's story "Spec Evo: Void Entry" Projects Status My Blog (SE Blog) Youtube Channel: https://www.youtube.com/channel/UCyBzYPIsLp0uHoPtT6ZEyww | |
![]() |
|
| Tartarus | Aug 7 2017, 07:16 PM Post #2 |
|
Prime Specimen
![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
The complete lack of sunlight would be a serious issue. With no sun warming the planet developing any life at all, let alone complex multicellular lifeforms, would be a huge challenge, if not an outright impossibility. |
![]() |
|
| truteal | Aug 7 2017, 07:21 PM Post #3 |
|
forum bigfoot
![]() ![]() ![]() ![]() ![]() ![]()
|
Maybe make the planet really volcanic, so hypothetical life forms get heat/light from the lava (it's definitely nonsensical, but it's an idea) |
|
My sporadically updated Youtube page Do you get it? I hardly ever come here so I'm like something a cryptozoologist would study | |
![]() |
|
| TAXESbutNano | Aug 7 2017, 07:30 PM Post #4 |
|
I'm going back to basics.
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
I believe they suggested the accretion disk providing light. I'm not sure if that would be stable over geological timescales? Man we are bad astronomers. |
![]() |
|
| Victorbrine | Aug 7 2017, 10:36 PM Post #5 |
|
Adult
![]() ![]() ![]() ![]() ![]() ![]()
|
The thing is that a black hole actually produces heat. With all the particles in chaotic motions inside the disk as it orbits the black hole, is said to produce energy released in the form of light and heat. It is also said that accretion disk can go from 1 million K to much higher (http://www.einstein-online.info/spotlights/accretion The part is at "Luminous disks"). Though it's the temperature inside the disk. However how much heat does it emit is the matter.
So the planet would have high volcanic activity? That would indeed create greenhouse gases, which will trap heat. But by doing so it pollutes the planet with sulphur and CO2 so I don't think that's possible, let alone the fact that life could thrive on a Venus like atmosphere. |
|
“There's a tree," Starflight said, jumping to his feet. "In the forest." "No way," Glory said. "A tree in the forest?” "Ce corps qui s'appelait et qui s'appelle encore le saint empire romain n'était en aucune manière ni saint, ni romain, ni empire." -Voltaire "So if you wake up in the morning and it's a particularly beautiful day you'll know we made it." -Capa "One of those capsules hit a wing." Victor said. "Had to do an emergency landing." He pointed to a crumpled plane a couple dozen meters behind him and shrugged. "Not my most elegant landing." -me in Flisch's story "Spec Evo: Void Entry" (Act 3) "but by rule 34 of the multiverse, if it exists, there’s a world full of it." -Tet "I must ask you to leave now." -Everyone (not realy though) in Flisch's story "Spec Evo: Void Entry" Projects Status My Blog (SE Blog) Youtube Channel: https://www.youtube.com/channel/UCyBzYPIsLp0uHoPtT6ZEyww | |
![]() |
|
| LittleLazyLass | Aug 7 2017, 10:57 PM Post #6 |
![]()
Proud quilt in a bag
![]()
|
That is an awfully unhelpful title. |
totally not British, b-baka! You like me (Unlike)I don't even really like this song that much but the title is pretty relatable sometimes, I guess. Me What, you want me to tell you what these mean? Read First Words Maybe | |
![]() |
|
| Holben | Aug 8 2017, 01:18 AM Post #7 |
![]()
Rumbo a la Victoria
![]()
|
Accretion discs are very temporary structures, estimated just a few million years on average. They also fluctuate enormously in luminosity. The X rays originate in accretion discs too, not from the event horizon. Black holes do radiate themselves via Hawking radiation, but for a big black hole its surface temperature is likely to be below CMB temp. |
|
Time flows like a river. Which is to say, downhill. We can tell this because everything is going downhill rapidly. It would seem prudent to be somewhere else when we reach the sea. "It is the old wound my king. It has never healed." | |
![]() |
|
| Victorbrine | Aug 8 2017, 01:43 AM Post #8 |
|
Adult
![]() ![]() ![]() ![]() ![]() ![]()
|
Well then can accretion discs spin at a certain speed that doesn't let it get sucked into the black hole in millions of years but instead it would be gone in billions of years? |
|
“There's a tree," Starflight said, jumping to his feet. "In the forest." "No way," Glory said. "A tree in the forest?” "Ce corps qui s'appelait et qui s'appelle encore le saint empire romain n'était en aucune manière ni saint, ni romain, ni empire." -Voltaire "So if you wake up in the morning and it's a particularly beautiful day you'll know we made it." -Capa "One of those capsules hit a wing." Victor said. "Had to do an emergency landing." He pointed to a crumpled plane a couple dozen meters behind him and shrugged. "Not my most elegant landing." -me in Flisch's story "Spec Evo: Void Entry" (Act 3) "but by rule 34 of the multiverse, if it exists, there’s a world full of it." -Tet "I must ask you to leave now." -Everyone (not realy though) in Flisch's story "Spec Evo: Void Entry" Projects Status My Blog (SE Blog) Youtube Channel: https://www.youtube.com/channel/UCyBzYPIsLp0uHoPtT6ZEyww | |
![]() |
|
| Holben | Aug 8 2017, 03:31 AM Post #9 |
![]()
Rumbo a la Victoria
![]()
|
The disc material falls in due to friction and gravitational effects. Additionally, any clumping or foreign objects moving into the disc will disrupt it and cause infall or expulsion of material. To maximise the lifespan of the disc, speed isn't all that important. Low density, high uniformity, and a really big primary would take you to the upper ends of disc lifespan, but that would still only be millions of years. |
|
Time flows like a river. Which is to say, downhill. We can tell this because everything is going downhill rapidly. It would seem prudent to be somewhere else when we reach the sea. "It is the old wound my king. It has never healed." | |
![]() |
|
| Greta | Aug 24 2017, 12:32 AM Post #10 |
|
Zygote
![]()
|
So you'd need truteal's suggestion of tidal flexing to provide the energy. It might be a a frozen waterworld with a rocky core, with hydrothermal vents not so deep that the water pressure would crush them. Life would evolve slowly (you might want to give it 100 billion years or so), but such time spans are no problem for black holes. However, it's probably impossible for a technological species like humans to evolve underwater due to lack of fire unless they create innovative biotechnology through selective breeding of tubeworms over billions of years...?? |
![]() |
|
| 1 user reading this topic (1 Guest and 0 Anonymous) | |
| « Previous Topic · General Spec · Next Topic » |








You like me 



7:50 PM Jul 10