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If you fancy a deep dive into black holes (in general; a deep dive into an individual BH is not recommended) then A Short History of Black Holes by Dr Becky Smethurst is excellent. And then what might happen once the BH finishes collapsing read White Holes by Carlo Rovelli, which is a beautiful read.
Tell that to Dr. Hans Reinhardt.
 
Yes, it might have been better to just say Primary (maybe - dead is after all an adjective in front of star - a corpse is also a dead human). And yes, it counts for the DM-1 if it's dead.

The potential complication is that for the Primary star, if you go down the default table path, a roll of 2- gets you the Special column, which doesn't include dead stars as a Primary - this matches the maps in Charted Space (except for a few purposefully placed objects), but not so much 'Reality'* where single white dwarfs - or pairs of white dwarfs, or the same for brown dwarfs, neutron stars, plus black holes, and mixes of the list - are often the only 'stars' (objects-formerly-known-as-stars?) in the system. For "Reality" as the text suggests, it might be more fun to use the Unusual column instead. And the Optional Variant on page 16 that will make many more red dwarfs.

*Or that version of "Reality" in which the universe is arranged in a single layer of hex-shaped cells.
Is the Primary the hottest object in the system or the most massive?
If you are only dealing with stars then they will be the same, but as soon as you have a post Stella object, like a black hole, neutron star, or white dwarf (I will have to check that one: can a white dwarf mass more than a red dwarf?) then they can be heavier but colder.
If hottest then which star is the primary can change over the system’s life.
 
Some more questions (I won't use a list this time so the numbering doesn't get messed up):

1. p48, For orbits around secondary stars, ... but if the star (or star and companion pair) range of orbits, from MAO to the outermost allowed Orbit#, divided by the number of worlds is more than the system spread...
Does "number of worlds" here mean for the entire system or for the secondary star/pair in question?

2. p55, Significant Moon Quantity, DM-1 per die if Planet is an orbital slot adjacent to a companion:
Is this intended only for moons around planets in a circumbinary orbit around the host+companion, or also for any planets around either star if orbiting one or the other independently?

3. p55, Significant Moon Quantity, DM-1 per die if Planet is in the adjacent orbital slot to the outermost Orbit# range of a Close, Near or Far star:
As above, if the star in question is a host+companion pair, is this modifier intended only for planets that are in a circumbinary orbit?

4. p57, Significant Moon Sizing for planets of Size 1 treat moons of lesser size as Size S:
a. Does this apply to all planets (i.e. Gas Giants) or just moons around Terrestrial planets?
b. Does this convert planetary rings (Size 0) to small moons?
 
Some more questions (I won't use a list this time so the numbering doesn't get messed up):

1. p48, For orbits around secondary stars, ... but if the star (or star and companion pair) range of orbits, from MAO to the outermost allowed Orbit#, divided by the number of worlds is more than the system spread...
Does "number of worlds" here mean for the entire system or for the secondary star/pair in question?
For the star or pair in question.

2. p55, Significant Moon Quantity, DM-1 per die if Planet is an orbital slot adjacent to a companion:
Is this intended only for moons around planets in a circumbinary orbit around the host+companion, or also for any planets around either star if orbiting one or the other independently?
The thinking is that no matter, what the companion causes more gravitational chaos, so all of the above.
3. p55, Significant Moon Quantity, DM-1 per die if Planet is in the adjacent orbital slot to the outermost Orbit# range of a Close, Near or Far star:
As above, if the star in question is a host+companion pair, is this modifier intended only for planets that are in a circumbinary orbit?
All of the above except remember, only apply the DM-1 once, no matter how many of the bullet points are met (well, assuming at least one of the conditions is met)
4. p57, Significant Moon Sizing for planets of Size 1 treat moons of lesser size as Size S:
a. Does this apply to all planets (i.e. Gas Giants) or just moons around Terrestrial planets?
I'm assuming you mean the statement "If a planet is Size 1, then any moon less than its Size is Size S." That's just to avoid negative or zero size results. And Gas Giants are a different scale - a Size 1 gas giant is equivalent in size to a Size 8 terrestrial.

b. Does this convert planetary rings (Size 0) to small moons?
It shouldn't. Wording is bad. Rings should stay rings. The rule is only intended to keep moons from being bigger than their planets. So if you're coding it, assume 'any moon' means it is still a moon, but if you've already found it to be size 0., it's no longer a moon but a ring, so not subject to the subsequent modification. (I don't know if that sounds like a coder or lawyer answer, but I know what I think I meant.)
 
I'm assuming you mean the statement "If a planet is Size 1, then any moon less than its Size is Size S." That's just to avoid negative or zero size results. And Gas Giants are a different scale - a Size 1 gas giant is equivalent in size to a Size 8 terrestrial.

It shouldn't. Wording is bad. Rings should stay rings. The rule is only intended to keep moons from being bigger than their planets. So if you're coding it, assume 'any moon' means it is still a moon, but if you've already found it to be size 0., it's no longer a moon but a ring, so not subject to the subsequent modification. (I don't know if that sounds like a coder or lawyer answer, but I know what I think I meant.)
If I'm understanding correctly, then the simple way to say all of this is to treat any Moon with a Size of less than 0 as Size S.

The planet's own size was already considered when rolling the moon's size, so mentioning Size 1 planets specifically both overcomplicates it and causes the rule to fail when it shouldn't, e.g. any Size 2 to Size 5 planet could also potentially roll up a moon of size -1 or less.

Speaking of that, is the rule for "Exactly 2 less than the planet's Size" mutually exclusive with the above rule, and if not, is it applied before or after the above adjustment? E.g. Planet = Size 2, Moon Size rolls 6 then 2 for a Size of -1; that triggers the first rule, becoming Size S, which may or may not be considered exactly 2 sizes less than 2, which could then trigger the next rule.
 
If I'm understanding correctly, then the simple way to say all of this is to treat any Moon with a Size of less than 0 as Size S.

The planet's own size was already considered when rolling the moon's size, so mentioning Size 1 planets specifically both overcomplicates it and causes the rule to fail when it shouldn't, e.g. any Size 2 to Size 5 planet could also potentially roll up a moon of size -1 or less.
And I already said that in the paragraph before, so I suppose that sentence was entirely unnecessary.
Speaking of that, is the rule for "Exactly 2 less than the planet's Size" mutually exclusive with the above rule, and if not, is it applied before or after the above adjustment? E.g. Planet = Size 2, Moon Size rolls 6 then 2 for a Size of -1; that triggers the first rule, becoming Size S, which may or may not be considered exactly 2 sizes less than 2, which could then trigger the next rule.
I was just looking at that as part of my first answer. It all gets a little confusion with Size 1 and even with Size 2 -a result on the table of D3-1 will give you a Size 1 or 2 moon a third of the time. Yeah, I'll mark that whole paragraph as 'ripe for a rewrite'.
 
Typo on p109 Basic Mean Temperature, -85C = 188K but is listed incorrectly as 178K

I'm working on Basic Temperature and bouncing around between p108, 47, and 59, as well as p251 in the Core rulebook, trying to piece it all together.

For the Extended method, if I just want a basic temperature for a world, what is the intended process?

a. Roll 2D + DMs per Core p251 and apply no other modifiers
b. Roll 2D + atmospheric DMs on WHB p47 (which seem exactly the same as those on Core p251), then apply HZCO DMs from WBH p109
c. "Roll" 7 with a DM of +/-5 per the HZCO Deviation chart on WBH p47 (or, if further in/outside the HZCO, the HZCO DMs from WHB p109); then apply atmospheric DMs
d. Any of the above
e. None of the above

I like "c" since it's sort of science-y feeling without going full Advanced Temperature, but I do wonder if I'm completely misinterpreting something.
 
Typo on p109 Basic Mean Temperature, -85C = 188K but is listed incorrectly as 178K
Yep, my bad. Noted
I'm working on Basic Temperature and bouncing around between p108, 47, and 59, as well as p251 in the Core rulebook, trying to piece it all together.

For the Extended method, if I just want a basic temperature for a world, what is the intended process?

a. Roll 2D + DMs per Core p251 and apply no other modifiers
b. Roll 2D + atmospheric DMs on WHB p47 (which seem exactly the same as those on Core p251), then apply HZCO DMs from WBH p109
c. "Roll" 7 with a DM of +/-5 per the HZCO Deviation chart on WBH p47 (or, if further in/outside the HZCO, the HZCO DMs from WHB p109); then apply atmospheric DMs
d. Any of the above
e. None of the above

I like "c" since it's sort of science-y feeling without going full Advanced Temperature, but I do wonder if I'm completely misinterpreting something.
a. and b. are almost the same, since the p.109 DMs are just extensions of "hot edge/cold edge" optional DMs.
c. is good for a basic temperature, but if you're not planning to mess with albedo or other factors that modify High and Low temperatures on the following pages, then b. would work to get some variance.
 
You're the best!

And yes, I'm planning to stick with basic temperature for now, my brain needs some serious R&R before I tackle the advanced version.

One more temperature question:
p109: Adhere to divisional differential value translation when HZCO# or Orbit# is less than 1
I calculate DM+15 for Orbit# 0.4 and HZCO 3.5:
Inner: 1 - 0.4 = 0.6 / 0.05 = DM+12
Outer: 3.5-1 = 2.5 - max(1, 0.4) = 2.5 - 1 = 1.5 / 0.5 = DM+3

And DM+8 for Orbit# 0.4 and HZCO 0.9:
Inner: HZCO-1 = 0.8; 0.8 - 0.4 = 0.4 / 0.05 = DM+8
Outer: HZCO-1 = 0.8 - max(1, 0.4) = -0.2 = no additional modifier

Does that math check out with your spreadsheet? EDIT: Those are before adding the standard DM +/- 4 for being outside the HZCO.
 
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You're the best!

And yes, I'm planning to stick with basic temperature for now, my brain needs some serious R&R before I tackle the advanced version.

One more temperature question:

I calculate DM+15 for Orbit# 0.4 and HZCO 3.5:
Inner: 1 - 0.4 = 0.6 / 0.05 = DM+12
Outer: 3.5-1 = 2.5 - max(1, 0.4) = 2.5 - 1 = 1.5 / 0.5 = DM+3

And DM+8 for Orbit# 0.4 and HZCO 0.9:
Inner: HZCO-1 = 0.8; 0.8 - 0.4 = 0.4 / 0.05 = DM+8
Outer: HZCO-1 = 0.8 - max(1, 0.4) = -0.2 = no additional modifier

Does that math check out with your spreadsheet? EDIT: Those are before adding the standard DM +/- 4 for being outside the HZCO.
That looks correct
 
Sorry, one more question:
p80, Runaway Greenhouse Effect: The temperature of any runaway greenhouse world is assumed to be boiling for Hydrographics code generation purposes.
Is the intent to leave temperature as rolled, e.g. 10-12+, and just treat it as boiling for Hydrographics?
Or is the intent to increase temperatures of < 12 to at least 12?

Either way is easy enough, but maybe adding +2 to temperature would mess things up later.
 
Sorry, one more question:

Is the intent to leave temperature as rolled, e.g. 10-12+, and just treat it as boiling for Hydrographics?
Or is the intent to increase temperatures of < 12 to at least 12?

Either way is easy enough, but maybe adding +2 to temperature would mess things up later.
Perhaps poor wording again. The intent was to make sure the Hydrographics DM becomes -6. Whether or not to bump it to a 12 if it's less, that's less clear. I wouldn't change the temperature to 12 unless you don't plan to do any more work on the temperature.

Problem is we only have Venus as a real example. It's possible that after the water all escapes, conditions can change, but the water, once it escapes, is gone for good. Unless you start terraforming the world or there is some deep underground aquifer to draw from. But that's all speculative. I hate it that for most world types we have a sample size of one, but that's where we are. At least this century we have a good and growing sample set of exoplanets.
 
p132 Habitability DM table, 2nd line for Gravity should be 0.2-0.4 (rather than 0.2-0.7); as is, it crosses the encompasses the next gravity threshold of 0.4-0.7
 
p132 Habitability DM table, 2nd line for Gravity should be 0.2-0.4 (rather than 0.2-0.7); as is, it crosses the encompasses the next gravity threshold of 0.4-0.7
Yep. Darn it, that was on me... added to the list.
 
Is there something in WHB to indicate how appealing a planet is to a given species, but the same planet may be more or less appealing to another species?
Conversely is there some kind of score a species has to interact with this 'appeal' or 'suitability' score?
 
Is there something in WHB to indicate how appealing a planet is to a given species, but the same planet may be more or less appealing to another species?
Conversely is there some kind of score a species has to interact with this 'appeal' or 'suitability' score?
There's the Terra-centric Habitability Rating on p132.

If you have a specific sophont in mind, you could adapt the DMs on that table and use that to calculate it for them, but I don't think there's a process to determine that "in general."
 
Couple more for the list:
- p103, Hydrographics Profile indicated as H-D..., but the two examples immediately below it use a colon instead of dash (i.e. H:D)
- p103, ajthough -> although
 
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