Jupiter, the planet.

Its distance from Sol is 5.2 AU (770 million km).

Earth has 10% the diameter of Jupiter, and Jupiter in turn has 10% the diameter of Sol.

Jupiter's mass is 2.5 times that of all the other planets in the Solar System combined—this is so massive that its barycentre with the Sun lies above the Sun's surface at 1.068 solar radii from the Sun's centre.[44] Jupiter is much larger than Earth and considerably less dense: its volume is that of about 1,321 Earths, but it is only 318 times as massive.[7][45] Jupiter's radius is about one tenth the radius of the Sun,[46] and its mass is one thousandth the mass of the Sun, so the densities of the two bodies are similar.[47] A "Jupiter mass" (MJ or MJup) is often used as a unit to describe masses of other objects, particularly extrasolar planets and brown dwarfs.

Somehow, while school had plenty of astronomy and I liked those parts, no one told me astronomy was this interesting!

Theoretical models indicate that if Jupiter had much more mass than it does at present, it would shrink.[49] For small changes in mass, the radius would not change appreciably, and above 160%[49] of the current mass the interior would become so much more compressed under the increased pressure that its volume would decrease despite the increasing amount of matter. As a result, Jupiter is thought to have about as large a diameter as a planet of its composition and evolutionary history can achieve.[50] The process of further shrinkage with increasing mass would continue until appreciable stellar ignition was achieved, as in high-mass brown dwarfs having around 50 Jupiter masses.[51]

Although Jupiter would need to be about 75 times more massive to fuse hydrogen and become a star, the smallest red dwarf is only about 30 percent larger in radius than Jupiter.[52][53] Despite this, Jupiter still radiates more heat than it receives from the Sun; the amount of heat produced inside it is similar to the total solar radiation it receives.[54] This additional heat is generated by the Kelvin–Helmholtz mechanism through contraction. This process causes Jupiter to shrink by about 1 mm (0.039 in)/yr.[55][56] When formed, Jupiter was hotter and was about twice its current diameter.[57]

Buffering is this wonderful trait where you can speak directly to me, and I won't hear a word.

Then you might call me out by name, and I'll say "What?", and then the contents of what you just said will start loading in my brain.

Then I will interrupt you and answer the question you asked just as you begun to repeat it.

– romankogan.net/adhd/#Buffering

This happens to me. Or I am aware that you said something, but it's like the language centers of my brain are temporarily offline. Then they gets plugged in and suddenly it makes sense all at once.

It's one part of why conversations can be exhausting… this can happen in the middle of your talking, then I try to pretend that I am still listening but I have to keep in my memory your last sentence while I wait for it to make sense, and then catch up remembering what you said since.

The ability to convert in your head between m/s and km/h can be useful in conversations (about astronomy, vehicle speeds, wind…).

From m/s to km/h, the multiplication factor is 3600/1000 (seconds and meters) = 36/10 = 3.6. I suppose a quick head rule is to multiply by three and then add a bit.

So 20 m/s is 72 km/h. And the speed of light 300 Mm/s is about 950 Mm/h, or 950 000 000 km/h.

From km/h, the multiplication factor is the inverse of that, 1/3.6 = 0.2777…, or if you prefer, 1000/3600 = 10/36 = 5/18. I suppose a quick head rule is to just take a fourth of the number; 0.27 is close to 0.25.

From km/h to m/s: the multiplication factor is the inverse of above, so instead of multiplying by 3.6, you divide by 3.6, or multiply by 1/3.6 = 0.2777… Or just take the fourth of the km/h number and add a bit. But I think I heard of a neater rule for this.

Notice a surface generality: always expect the km/h number to be bigger than the m/s number.

#ADHD

I can only bear so long with being told what to do.

I absolutely can't stand the feeling of being controlled.

Tell me what you need, I'll figure out myself how to make that happen, thank you.

Oh. But also I absolutely can't estimate the time it will take me. And I will perceive any sort of nudging and reminding as being told what to do, and might blow up.

Say, you want me to make dinner by 4PM. I agree. 4PM comes, I am doing something else. You start asking me what I'm doing , tell me I promised to be cooking dinner at 4PM, tell me to start cooking, etc.

Whereas at that moment, I could be stuck either in ADHD Paralysis or False Dependency Chain. In my mind, I am cooking dinner. Though I am fixing the cats' house and paying the student loan bill at this moment, it's because it needs to be done so that I could cook dinner!

Or if I am doing nothing at all, it's on the outside, whereas on the inside the task at hand is all I am thinking of. Being told to do what you are preparing and mustering up the energy to do yourself is very hard to bear.

The compromise I'm figuring out is as follows:

• You tell me what you want (the result, not what you want me to do or how I should do it).
• We agree on a time
• Crucial: develop a Plan B and tell me what you'll do if I don't start by that time. Whatever you do must work out for you. Imagine me being unable to do whatever I promised because I fell off a bike, what would you do? Decide now, and tell me. (Example: if you don't start cooking by 3:30PM, I'll go out and have dinner by myself).
• When the time comes, either observe that I'm starting as promised, or notify me that you are initiating Plan B ("It's 3:25PM, I'm leaving in 5 minutes").

Sounds crazy? It is. But the thing is:

• It works
• It provides a rigid structure for me: knowing what happens if I postpone the task provides the rigid structure within which I can operate
• It doesn't involve telling me what to do, or any control. Either I do it, or Plan B activates – either way, there are no surprises, and you are not left stranding.