Jumping away from gas giants

[Sigtrygg]

What's the diameter of Jupiter's 'solid core' ?

The curvature of space time in Jupiter's vicinity requires that we know the mass/energy/pressure/momentum of Jupiter, the bulk of which is its 'atmosphere'.

diameter/gravity then multiply by 100 brings it more into line with a rocky body (it will still be 3 or so times further than a rocky planet

diameter x gravity x 100 makes things worse - think about the maths and what you want to achieve.

 

[Condottiere]

Usually I would reverse engineer the desired result, which when squares and square roots make an appearance, cross referenced likely to Terra.

Since the guesswork for Jupiter core is anywhere between five to fifteen percent mass, with a two hundred fifty percent Terran standard gravity, assuming that's correct.

So, one hundred forty kay diameter with atmosphere, you'd want a core of fifty six kay kilometres for status quo.

Would I bet on that being the actual core diameter? No.

 

[Reynard]

Gravity (from Latin gravitas 'weight' ), or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light —are brought toward (or gravitate toward) one another.

 

[Sigtrygg]

Usually I would reverse engineer the desired result, which when squares and square roots make an appearance, cross referenced likely to Terra.

Since the guesswork for Jupiter core is anywhere between five to fifteen percent mass, with a two hundred fifty percent Terran standard gravity, assuming that's correct.

So, one hundred forty kay diameter with atmosphere, you'd want a core of fifty six kay kilometres for status quo.

Would I bet on that being the actual core diameter? No.

And it is a waste of time using the core, since the gravity of jupiter is also generated by the mass/energy/pressure/momentum of its atmosphere.

I posted earlier that the maths for tidal forces give a better correlation to the 100D rule since the cube root is used,,,

 

[Sigtrygg]

Gravity (from Latin gravitas 'weight' ), or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light —are brought toward (or gravitate toward) one another.

Gravity is the perceived result of the warping of space time by the mass/energy/momentum/pressure of a body.
https://www.youtube.com/watch?v=wrwgIjBUYVc&list=PLu7cY2CPiRjVCbSWwSe0mXxWK0S8e8Ssx
https://www.youtube.com/watch?v=xodtfM1r9FA&list=PLu7cY2CPiRjVY-VaUZ69bXHZr5QslKbzo

 

[Baldo]

Same goes for stars.

Yep. Which can be problematic. Take a look at the red giant in Acrid/Trojan Reach and tell me where to place the mainworld. If you place it in the habitable zone, it's still weeks away by manoeuvre drive. You can place Acrid in the outer system, but that makes its corrosive atmosphere difficult to explain. But hey, that's half the fun, right? Finding a reason that such things exist.

Yeah, I don't see a problem with this. The Martin II is NOT a tramp trader on a tight schedule, after all. Besides, "Acrid" is merely a single planet in a system with "3 Gas Giants — 0 Planetoid Belts — 9 Other Worlds" (Travellermap) and "GeDeCo's (...) major facilities" (Book 2, page 185). Clearly, the outsystem here is well developed with infrastructure for commercial traffic, and the Martin II just need to visit Acrid for undisclosed reasons. Nothing strange at all, I say.

 

[Condottiere]

Something kickstarts the attraction process in the first place.

 

[Sigtrygg]

The mechanisms by which accretion takes place are very well understood.

 

[Condottiere]

Each planet began as microscopic grains of dust in the accretion disk. The atoms and molecules began to stick together, or accrete, into larger particles. By gentle collisions, some grains built up into balls and then into objects a mile in diameter, called planetesimals. These objects were big enough to attract others by gravity rather than by chance.

If the collisions of planetesimals occurred at high speeds, they could shatter the objects. But when impacts were gentle enough, the objects combined and grew. For some 10 to 100 million years these protoplanets orbited the Sun, some in egg-shaped circuits that resulted in more frequent collisions.

https://www.khanacademy.org/humanities/big-history-project/solar-system-and-earth/earth-and-form-solar-system/a/how-our-solar-system-formed#:~:text=Planets%20form%20from%20particles%20in,attracted%20by%20the%20star's%20gravity.


Essentially, they need to achieve critical mass.

Going by this explanation, speedbumps would need to be at least a mile in diameter.

 

[peelseel2]

For simplicity I maintain the 100d limit. For explanation I say it is because the volume of the object casts a 100x 'volumetric' shadow in Jumpspace. Entering jumpspace in this 'shadow' can be dangerous. Nothing to do with gravity.

 

[Reynard]

Oooor that's how gravity works in Traveller universes. Similar to us yet different.

 

[MonkeyX]

As a side question is there anywhere in the 2e rules that determine the size of gas giants? I couldn’t find any after a quick search.