|
Science and Astronomy Questions
|
|
| steeljaw354 | Date: Tuesday, 01.11.2016, 21:37 | Message # 901 |
 World Builder
Group: Users
Pirate
Messages: 862
Status: Offline
| What if Jupiter was a brown dwarf?
|
| |
| |
| Alek | Date: Wednesday, 02.11.2016, 04:32 | Message # 902 |
 Pioneer
Group: Users
United States
Messages: 326
Status: Offline
| Quote steeljaw354 (  ) What if Jupiter was a brown dwarf?
I'll run a Universe Sandbox simulation overnight and inform you of the answer tomorrow.
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
|
| |
| |
| Alek | Date: Wednesday, 02.11.2016, 17:33 | Message # 903 |
|
Pioneer
Group: Users
United States
Messages: 326
Status: Offline
| So, if Jupiter was 30 times its current mass, but had about the same orbit, then within just a few thousand years it would make all the planets beyond its orbit be pulled inward in such a way that the orbits would be very eccentric and Saturn would be in danger of being slingshotted out of the solar system completely. As for the inner solar system, the orbits would stay stable but Earth might get hit with a few asteroids because eventually Jupiter's gravity would slow down most of the asteroids in the asteroid belt, especially the smaller ones, and they would fall into the inner solar system.
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
|
| |
| |
| steeljaw354 | Date: Wednesday, 02.11.2016, 19:02 | Message # 904 |
|
World Builder
Group: Users
Pirate
Messages: 862
Status: Offline
| I mean if it was like that from the start if it formed that way.
|
| |
| |
| Alek | Date: Wednesday, 02.11.2016, 19:21 | Message # 905 |
|
Pioneer
Group: Users
United States
Messages: 326
Status: Offline
| Quote steeljaw354 ( ) I mean if it was like that from the start if it formed that way.
Oh
Well in that case, the planets that are now beyond Jupiter would probably have to be farther away from the sun then they are now, and Saturn would probably be either smaller or nonexistent, there would be no asteroid belt and most of that debris would probably be moons of Jupiter or would be Earth-orbit-crossing asteroids, and Mars might either be smaller or more likely nonexistent, and due to the higher number of impacts here on Earth, life would either not exist or be very different.
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
|
| |
| |
| Alek | Date: Wednesday, 02.11.2016, 19:23 | Message # 906 |
|
Pioneer
Group: Users
United States
Messages: 326
Status: Offline
| Also,
Quote Alek ( ) I don't remember where, but I read an article that states how this "uncertainty" came about and did so in a non misleading way (aka not leading you to believe scientists have thrown out the accelerating universe model, since they explained that the observational data is technically within the margin of error but the measurements agree enough that the theory can't simply be considered rubbish and random chance/noise)
Here's the article I was talking about.
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
|
| |
| |
| PlutonianEmpire | Date: Thursday, 03.11.2016, 04:15 | Message # 907 |
 Pioneer
Group: Users
United States
Messages: 475
Status: Offline
| Here's something more in the realm of psychology: Why do most people find extremely high fields of view attractive, in terms of pictures and video game screenshots? Or why are wide fields of view considered pretty and low fields of view considered ugly?
Specs: Dell Inspiron 5547 (Laptop); 8 gigabytes of RAM; Processor: Intel® Core™ i5-4210U CPU @ 1.70GHz (4 CPUs), ~2.4GHz; Operating System: Windows 7 Home Premium 64-bit; Graphics: Intel® HD Graphics 4400 (That's all there is :( )
|
| |
| |
| Watsisname | Date: Thursday, 03.11.2016, 05:48 | Message # 908 |
 Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| Interesting question! My guess (and it totally is just wild speculation) would be that it derives from our hunter-gatherer days. Being able to see a wider view of your surroundings is beneficial to gather information about food, resources, predators or rivals and approaching weather. It could be related to why we associate views from high places and mountain tops as being aesthetic.
|
| |
| |
| Alek | Date: Thursday, 03.11.2016, 14:29 | Message # 909 |
|
Pioneer
Group: Users
United States
Messages: 326
Status: Offline
| Quote Watsisname ( ) It could be related to why we associate views from high places and mountain tops as being aesthetic.
Which just so happens to be where I take 95% of my SE screenshots 
EDIT: Okay, so, not sure where else to post this, so I will here. Is there currently any software out there right now that can test the stability of orbits over millions or billions of years in a reasonable amount of time (aka not having to dedicate 5 years of my life to wait for a simulation to run a few million years accurately)?
EDIT 2: Also, I've looked everywhere, but is there some sort of substance that could be a liquid with a lower viscosity than glass in a -19.84°F, 0.0247 Atm pressure environment? (It wouldn't have to have water-like viscosity, maybe more like lava? Just something that could move in a reasonable amount of time. Even if it evaporates after a few hundreds or thousands of years, if I can find a way to renew the supply, having it evaporate after awhile would be okay.)
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
Edited by Alek - Thursday, 03.11.2016, 18:19 |
| |
| |
| Watsisname | Date: Friday, 04.11.2016, 03:10 | Message # 910 |
|
Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| Quote Alek ( ) Is there currently any software out there right now that can test the stability of orbits over millions or billions of years in a reasonable amount of time (aka not having to dedicate 5 years of my life to wait for a simulation to run a few million years accurately)?
Indeed! There are packaged codes for n-body integrators using a variety of methods, and professional astronomers often use these to study the dynamics and stability of planetary systems. I don't have any experience in this area though, so I'm not sure how difficult it will be to learn how to use them.
https://www.boulder.swri.edu/~hal/swift.html
As for your second question... are we talking of substances which are common in nature, or can it be anything? I'm having a real hard time thinking of anything for this, but maybe Mercury works? This is the only reliable phase diagram I can find though, and it's definitely not clear as to what happens in the low-pressure regime. In these units you're looking at 0.000025 kbar and 244.4 K.
|
| |
| |
| Hornblower | Date: Friday, 04.11.2016, 14:46 | Message # 911 |
 World Builder
Group: Users
United States
Messages: 714
Status: Offline
| Ok, here's a tough one that I'm dying to know the answer to; What would it be like to have causation without correlation. At first glance it seems impossible, but there could be something.
|
| |
| |
| Alek | Date: Friday, 04.11.2016, 15:49 | Message # 912 |
|
Pioneer
Group: Users
United States
Messages: 326
Status: Offline
| Quote Watsisname ( ) Indeed! There are packaged codes for n-body integrators using a variety of methods, and professional astronomers often use these to study the dynamics and stability of planetary systems. I don't have any experience in this area though, so I'm not sure how difficult it will be to learn how to use them. https://www.boulder.swri.edu/~hal/swift.html
Considering that I have practically no knowledge of programs like that (ones where "parameters" are entered into some type of text file and then the whole thing still needs to be complied) that would be quite difficult, but I guess thats to be expected, since basically everyone using that niche of a program is probably a researcher, which of course would know these things.
Quote Watsisname ( ) As for your second question... are we talking of substances which are common in nature, or can it be anything? I'm having a real hard time thinking of anything for this, but maybe Mercury works? This is the only reliable phase diagram I can find though, and it's definitely not clear as to what happens in the low-pressure regime. In these units you're looking at 0.000025 kbar and 244.4 K.
In this case, as long as it's not too complex of a substance (i.e. the only way it could possibly be made would be through mankind) pretty much anything would work, though the more common the material the better. Mercury seems to work according to that, but I agree, it is sort of unclear, and only barely works..
Too bad Thermo-calc is a hassle to get and seems to be more for metallurgy researchers and the academic version is limited as such that I probably wouldn't be able to find what I'm looking for...
Living among the stars, I find my way. I grow in strength through knowledge of the space I occupy, until I become the ruler of my own interstellar empire of sorts. Though The world was made for the day, I was made for the night, and thus, the universe itself is within my destiny.
Edited by Alek - Friday, 04.11.2016, 15:53 |
| |
| |
| Banana | Date: Friday, 04.11.2016, 23:45 | Message # 913 |
 Astronaut
Group: Users
United States
Messages: 56
Status: Offline
| Hornblower, suppose variable X causes the value of variable Y. Both these variables are affected by variable A, which has a equal chance of taking the value of either 1 or -1. Y is related to X in that Y=AX. There is no correlation among X and Y, though it is clear there is causation. I got this example from this website, which delves deeper into this subject.
Hello.
|
| |
| |
| Watsisname | Date: Saturday, 05.11.2016, 04:22 | Message # 914 |
|
Galaxy Architect
Group: Global Moderators
United States
Messages: 2613
Status: Offline
| Quote Hornblower ( ) What would it be like to have causation without correlation.
This happens all the time in quantum mechanics. For example, you can set up a particle to have a spin oriented in one direction (let's say "up"). If you then measure the spin on that axis, you will measure a spin of +1. If you instead measure the spin with your apparatus flipped upside down, you'll measure a spin of -1.
But suppose you measure the spin along an axis 90° away from that (say, "left"). In that case, you'll have an equal probability of measuring a spin of +1 and a spin of -1. Furthermore, if this was a pair of entangled particles, then if you measure a +1 on your particle, someone else making the same measurement on the other particle will measure a spin of -1.
This is pretty weird. There is a correlation between the spins of the two entangled particles (measuring one determines the other), but the result you get on your particle has exactly zero correlation to how the spin of the particles was prepared, despite being causally related to it.
To have causation with no correlation is to have physics without predictive power. It means the state of a system at A directly leads to the state of the system at a later time B, but the rules for how A leads to B cannot be known.
|
| |
| |
| Hornblower | Date: Saturday, 05.11.2016, 11:29 | Message # 915 |
|
World Builder
Group: Users
United States
Messages: 714
Status: Offline
| Banana, Watsisname, Thanks!
|
| |
| |
ENG
New site
Pirate 
United States 
