/sci/ - Science & Math

>What has themost effect on global temp, apohelion/perihelion diff. or axis tilt

tilt

>how should the axis tilt be?

not a clue

>- blue plants would reflect the most energetic light wavelenght, cooling down the world, so plants would be used during summer, no? (And red ones during the winter)

color of plants doesn't have to be sci-accurate

>>1147938

>color of plants doesn't have to be sci-accurate

That's treason to hard sci-fi!

Make the plants use X-rays.

>>1148026

Atom-sized chloroplasts, gee I wonder how easy that would be.

Have the planet near star being stripped by a rotating black hole and have the most epic extremophilic life ever.

If you're wanting the WHOLE planet to be an evenish temp., it would have to have a tilt of 0. If it were tilted like Earth, the Northern Hemisphere has a the opposite season as the South,

>>1148055

Super-badass shit appears during the second part, and the possible sequel.

This planet is supposed to be Earth-like, as in breathable, humanoid aliens (Is actually explained later, sort-of directed panspermia, and caused by the backstory. only explaantion becase in rality humanoid aliens wouldn't exist)

>>1148090

the plants regular the temperature making it even throughout the year by changing atmospheric composition & such.

>>1148091

>Super-badass shit

Elaborate. We get to decide whether or not it's badass enough.

>>1148091
Humanoid aliens could exist, it makes sense if it evolves once they will evolve again, after all on earth the eye evolved on several separate occasions.

And make it something cool, like the oxygen is locked in the soil with shit like hydrogen and sulphur and traces of platinum and shit and find chemical reactions that could create hydrogen and a sort of biochemical fire lighting system and have fucking dragons and when you're writing it listen to dream evil and dragonforce and write the most metal sci fi story of all time.

OF AWW TIME

How do you explain evolution allowing/forcing this to happen?

>>1148114

>Humanoid aliens could exist, it makes sense if it evolves once they will evolve again, after all on earth the eye evolved on several separate occasions.

I guess but most fans of hard-sf prefer "realistic" (Aka creatively designed) aliens. Those appear in the book, actually: Mars, and all the other non-humanoid aliens in the book are relatively "realistic", or at least, not humanoid.

>And make it something cool, like the oxygen is locked in the soil with shit like hydrogen and sulphur and traces of platinum and shit and find chemical reactions that could create hydrogen and a sort of biochemical fire lighting system and have fucking dragons and when you're writing it listen to dream evil and dragonforce and write the most metal sci fi story of all time.

Oh God.

I was going to add methane-burning dragons but DRAGON PLANTS is fucking epic.

Note taken, thank you 4chan.

>>1148128

A big fat "nvm lol".

>>1148134
Plants burning off gases would actually coincide with your environment changing idea as well.

They could release methane or massive amounts of CO2 to create a global warming effect, and by releasing certain volatile substances at certain light intensity levels (due to the tilt and "seasons" of the planet) could trigger the process through out populations of the vegetation.

>>1148170

Good, good, never thought about it.

*Takes note*

How does this sound?:

- Summer: Foliage growth explodes, more and more plants to absorb CO2. Temperature drops due to reduction of greenhouse effect.

- Winter: Some plants start burning chemicals, releasing massive amounts of CO2. They burn themselves, and the ashes are left for other plants to grow. Temperature increases due to greenhouse effect.

So the temperature would remain the same.

>>1148178
If the planet has predators or herbivorous animals you're gonna have some difficulty making this all work together.

>>1148205

Fuckers will have to deal with it.

>>1148202

I think for the changes to be that fast, the planet is going to have to be damn near carpeted with gigantic, fast-respiring plants. Like, a very appreciable amount of its total surface area.

I assume you're just having the plants biosynthesise different pigments seasonally, but surely the biggest difference in albedo would be accomplished by the plants turning from black to white? Certainly it's going to be hard to evolve a pair of photosystems in parallel that use different light-harvesting pigments.

Also here >>1148040 you say chloroplast but it's actually the electronic properties of the antenna complex that's the problem, but I guess it might just have been a slip-up.

>>1148134

>methane-burning dragons

bleh

>>1148209
I ain't the best at theoretical shit but you could have a sort of quartz exoskeleton on some of the prey animals, and quartz plating in the animals face to deal with any capsicum type shit the plants excrete.

>>1148236

Black & White would be simpler but other colours are prettier ':3~

>>1148246

>quartz exoskeleton
>prey animals
>quartz plating in the animals face

>>1148240
Agreed, hydrogen burning dragons would be cooler, they'd be able to fucking melt rock.

Could be a cool way for them to escape the atmospheres and hibernate kinda through the summer's where the plants burn off gases and shit.

>>1148265


They can actualy enter orbit, but I never considered doing that to letthem hibernate duringthe burning period. Good idea!

They just go into space to dive back and hunt, also they are sentient and have all these myths and superstitions: When they lay eggs the fly to the upper atmosphere and give birth there, letting them fall. Most are destroyed, but some land safely and those are considered lucky enough to live.

Hydrogen/Methane burners, note taken.

>>1148280
Dragons in orbit?

Cool idea but really how would it work? They'd have to be able to shit fire to get to the speeds needed.

Unless the planet has a weaker gravity from earth.

>>1148298

It is smaller and less massive (Though it has greater density) so yes the gravity is pretty low.

>>1148298

Or if it were rotating really fast. I'm thinking of the sundogs in Pratchett's book, it was either Dark Side of the Sun or Strata, one of those batshit insane sci-fi ones he wrote early on.

>>1148308
>>1148298

And they are huge so they can store enough methane... Plus the 'rockets' work in scramjet mode using air as reaction mass

>>1148314

Faster rotation.

Taking note.

Quartz-plated animals, biological scramjets...

I guess you're not writing "hard" sci-fi then?

>>1148321

lol...

>>1148321

I may not add the quartz, but the biological scramjets stay.

Maybe.

>>1148308
The smaller volume but higher density means that they are nearer the core which would bring the gravity back up.

>>1148336

Okay.

94% the size of Earth, fast rotation (18 hour day), less mass and less density.

Good?

>>1148352
Fuck if I know I can grasp the basics but if numbers get involved I'd have to start learning math again and those horrors never die.

And theres nothing to say that quartz plated animals couldn't exist, mind you chitin and keratin might be more efficient I dunno.

>>1148371

lol k

>>1148352

Probably good enough to make your plot work as long as people don't ask very very detailed questions.

You could give it a ludicrously short day, like, a couple of hours, that causes the planet to bulge visibly in the middle.

I'm going to just copy the stats for Venus

Mean radius 6,051.8 ± 1.0 km[3]
0.949 9 Earths
Flattening 0[3]
Surface area 4.60 × 108 km2
0.902 Earths
Volume 9.38 × 1011 km3
0.857 Earths
Mass 4.868 5 × 1024 kg
0.815 Earths
Mean density 5.204 g/cm3
Equatorial surface gravity 8.87 m/s2
0.904 g
Escape velocity 10.46 km/s

HAHAHAA WIKIPEDIA

>>1148371
>>1148371

You're right that biogenic materials would be more efficient. Just nucleating quartz on the outside of your body is going to be heavy, brittle, and difficult to repair. Much more likely are materials like nacre: biology is able to control growth at the nanoscale, which can lead to excellent strength/toughness to weight ratios.

>>1148055
>>1148055

that... sounds fucking awesome

>>1147894

Making red plants would mean that they reflect red light the most, ie the light that plants use to photosynthesize. Gl killing them off.

>>1149125

Well, the only reason they'd be red was if they were absorbing and using some other wavelength, employing a pigment other than chlorophyll, you gigantic fucking tool.