>And how exactly do people know all this stuff?
>No-one has been inside Jupiter, so in fact all that is
>pure speculation.
While nothing is set in stone, many aspects of this are quite likely to be accurate. The internal structure of a massive object can be deduced from several things:
- simple physics : put together a massive ball of 75% Hydrogen, 24% Helium and 1% "stuff" and you can calculate quite well what it would be like.
- gravitational effects : a ball the size of Jupiter that is totally uniform inside will have a different effect on orbiting objects than a non-uniform one, these differences can be measured and an estimate can be made of the density variations required to produce the effects
- Occam's razor : meaning : if multiple explanations are possible and you have no known way of choosing between them, choose the simplest explanation. In this case, a layer of metallic Hydrogen is the simplest explanation for the existence of such a huge magnetic field.
To learn more about all this, you might check out some Nasa websites, they have tons of info on this.
Jupiter has the largest magnetic field of any object in the solar system (except the sun). It is so large that if it were visible in the sky, it would stretch some 20-30 times the diameter of the moon.
Jupiter itself is layered, consisting of a thick outer layer of gas (predominantly Hydrogen & Helium) about 35.000km thick, within this, there is a "liquid" zone (although at the incredible pressures there, the distinction between liquid and gas is somewhat (pardon the pun) hazy.) This zone is about 25.000km thick. Inside this there is a solid ball of mostly metal which is about 20.000km in diameter. The magnetic field is actually produced in the liquid layer, parts of which are in a state called "metallic hydrogen", where hydrogen behaves as a conducting metal, creating one ginormous electromagnet.
Aurorae have been observed on Jupiter for years (Even Voyager detected them 25 years ago!). Galileo and Hubble have been taking pictures of them for years now.
What is new is the observation of an auroral "flare", a sudden and significant increase in auroral activity. Such flares are quite rare on earth, and probably on Jupiter too, so it's quite a lucky streak for Hubble to be observing at just the right time.
In fact, only a couple of months ago, Astronomy Picture of the Day released this:
http://antwrp.gsfc.nasa.gov/apod/ap001219.html
He could use his ZX Spectrum...
Ahh, "Use small key on door"
You see a small trap door.
Memories!
Re:The only Notes client is W32 !!! b'leeevit
on
IBM Releases SashXB
·
· Score: 2
While I agree with just about everything you say (unfortunately, because I would love to see a linux-Notesclient) - but for the console : in the linux version of domino, you get cconsole, which can be used to access the server admin console. It's probably available on the other Unix-Domino's.
My suspicion is that there will never be a Notes Client R6 and that IBM/Lotus will switch the lot over to a Java-based system (witness the Web-ified mailtemplate in R5 and DOLS as hints of things to come). That is probably also why they don't put any effort into developing an R5 client for Unix/Linux.
If you actually read the article, you would know that it lists KDE as being started in 1996 and Gnome in 1997 as a reaction to the Qt-licensing issues. BTW.
Re:Installing English (Germany) Language Pack...
on
Mozilla M17 Is Out
·
· Score: 1
Hyuu zay zis as if it vas not a good sing?
Ve are werry heppi to sjpeek ze inglisj zat ze rest of ze vorld sjpeekz.
If a company like RedHat or SUSE decided there was a sufficiently large market for a "trusted" distribution, wouldn't it be possible for them to go through "formal" procedures. Obviously, such a distro would never be cutting-edge, because of all the extra testing that needs to be performed. It's only if you try to look at all of "GNU/Linux" developement at the same time that you might say "anarchy rules". As soon as you get to the distros, you get far less chaos and far more control of what goes in. I think that such a thing would even be more "trustworthy" than closed source, because afterwards, you would be able to see all the source that went into the "trusted" distro.
It would be highly improbable to receive any living creatures from outside the solar system. One problem is that the travel times are _huge_ compared to inside the solar system, we're talking tens of millions of years. The other problem is that the speed at which such an object would impact on earth would be at minimum 5 times faster than a typical Mars rock (junk from outside the Solar System will have a speed of at least 72 km/s, the escape velocity from the sun at earth distance, an potentially several times faster still, if we hit it "head-on") This means it has to survive far harsher conditions on entering our atmosphere. The oldest known probable fossils on earth date from 3.5-3.8 billion years ago (formation of the solar system 4.5 billion years ago). Ironically, since Mars is smaller and further from the sun, it will have cooled more quickly and life may have developed on Mars and get transferred to earth... We may all be martians...
He's manipulating them this way : - pick the part with the largest price differential between Mac en PIII (ie. Ram) - add a ridiculous amount of it to the system - quote the whole system price without nuances
the reason I call it "manipulation" is that the system presented is not a realistic system. Nobody in their right mind buys a computer outfitted with 1 Gig of memory unless it servers a very specific purpose (ie. large servers or people who have to edit really, really huge graphic files).
If you want, I could probably create the exactly opposite situation by looking for some fancy schmansy superduper Mac videocard costing 6000$ and putting that in place of the ATI Rage Pro, then claiming that the Mac was far more expensive then the PC.
I stand by the statement that this is "fudging the figures". Although the prices are technically accurate, they are extremely misleading.
Wow, that's real smoov, how you put in a GIG of ram for two OS-ses which really really don't need it. (maybe for Photoshop it *could* be useful in extreme circumstances, but really...) And wouldn't you know, 1 GIG of RDRAM would set you back more than 5000$, so well over half the cost is in the ram. If you put in a more realistic 256 MB Ram (for anything but Photoshop), then the price of the Max drops by an enormous 700 bucks while the PC drops by a mere 4200 bucks.
If you say you want to use it as a server, then why OS 9 and Win98, both of which basically are USELESS as server OS's.
(BTW, if you go to a non-DELL company, offering Gigahertz Athlons, you can even use SDRAM-modules, reducing the price of an equivalent system further).
I don't care much for OS wars and stuff, but this kind of "Manipulating the figures" is something I really dislike.
But, the further you are from a planet, the lower the gravitational attraction will be, so the slower your acceleration to the planet. If you fall towards a planet from essentially infinity (just start a couple of light years out and hope there's nothing else nearby), you will very very slowly accelerate towards the planet. This acceleration will increase as you go nearer to the planet, albeit very slowly. It's only in the last part of the descent that the acceleration becomes reasonably high. This is where the term "Escape Velocity" comes from, this is the minimum speed away from the center of the planet you need to not fall back to the planet -ever-. For Earth's surface, it's about 12.7 km/s. If you started out twice as far away from Earth's center, you would to be going only a quarter of this speed to escape.
The object you are trying to describe, where you reach the speed of light before hitting the surface, is called a black hole, and the point where escape velocity reaches 300,000 km/s is called the event horizon. (what happens below this is uncertain, we do know now that black holes really exist, but everything below the event horizon is still very much theoretical physics - although some of it has been verified experimentally, and there was a story about optical black holes - a sort of massless simulation of a BH on/. a couple of months ago.
Not trying to be pedantic, but the K6 has got an FPU (worse than the PentiumII but roughly on par with the Pentium and certainly better than the Cyrix/IBM model of similar clock-frequencies). What it doesn't have is MMX/3DNow/SSE stuff, which is useless on almost any kind of server anyway.
Re:Out of the Real World
on
On to Mars
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· Score: 1
Actually, it would be completely useless to try to colonize other planets to reduce overpopulation on earth. Just consider it : Every year, about 70 million more people are born on earth then die. This means that just to keep our population stable at current levels, we would need to ship out this many people. This is close to 200,000 people per day, every day. How would you do this? Using rockets would be impossible, even the biggest regular rockets could only launch a couple of tens of people. Even if we had the technology to build space elevators, and we built say 5 of them around the equator, that would still mean lifting 40,000 people per elevator per day, and shipping them of of the top of the elevator. As it stands, we humans simply breed too fast to "orbit" us out of trouble. And, for the record, every time poverty was reduced somewhere, after a short while, birth rates dropped significantly. The solution for overpopulation is prosperity (although with prosperity tend to come other problems, like environmental pollution, which tend to offset the other gains...) Oh yes, it's a toughie awright...
Slashdot Mirror
>And how exactly do people know all this stuff?
>No-one has been inside Jupiter, so in fact all that is
>pure speculation.
While nothing is set in stone, many aspects of this are quite likely to be accurate. The internal structure of a massive object can be deduced from several things:
- simple physics : put together a massive ball of 75% Hydrogen, 24% Helium and 1% "stuff" and you can calculate quite well what it would be like.
- gravitational effects : a ball the size of Jupiter that is totally uniform inside will have a different effect on orbiting objects than a non-uniform one, these differences can be measured and an estimate can be made of the density variations required to produce the effects
- Occam's razor : meaning : if multiple explanations are possible and you have no known way of choosing between them, choose the simplest explanation. In this case, a layer of metallic Hydrogen is the simplest explanation for the existence of such a huge magnetic field.
To learn more about all this, you might check out some Nasa websites, they have tons of info on this.
Jupiter has the largest magnetic field of any object in the solar system (except the sun). It is so large that if it were visible in the sky, it would stretch some 20-30 times the diameter of the moon. Jupiter itself is layered, consisting of a thick outer layer of gas (predominantly Hydrogen & Helium) about 35.000km thick, within this, there is a "liquid" zone (although at the incredible pressures there, the distinction between liquid and gas is somewhat (pardon the pun) hazy.) This zone is about 25.000km thick. Inside this there is a solid ball of mostly metal which is about 20.000km in diameter. The magnetic field is actually produced in the liquid layer, parts of which are in a state called "metallic hydrogen", where hydrogen behaves as a conducting metal, creating one ginormous electromagnet.
Aurorae have been observed on Jupiter for years (Even Voyager detected them 25 years ago!). Galileo and Hubble have been taking pictures of them for years now.
What is new is the observation of an auroral "flare", a sudden and significant increase in auroral activity. Such flares are quite rare on earth, and probably on Jupiter too, so it's quite a lucky streak for Hubble to be observing at just the right time.
In fact, only a couple of months ago, Astronomy Picture of the Day released this:
http://antwrp.gsfc.nasa.gov/apod/ap001219.html
Bart Declercq
Hello, Koeieuier is no longer valid (unfortunately). The new spelling introduced at the start of the '90s makes it "koeienuier"...
Okay, you're getting boring, but I'll bite:
Apache vs. IIS
I'm goinh to bed now...
He could use his ZX Spectrum... Ahh, "Use small key on door" You see a small trap door. Memories!
While I agree with just about everything you say (unfortunately, because I would love to see a linux-Notesclient) - but for the console : in the linux version of domino, you get cconsole, which can be used to access the server admin console. It's probably available on the other Unix-Domino's.
My suspicion is that there will never be a Notes Client R6 and that IBM/Lotus will switch the lot over to a Java-based system (witness the Web-ified mailtemplate in R5 and DOLS as hints of things to come). That is probably also why they don't put any effort into developing an R5 client for Unix/Linux.
If you actually read the article, you would know that it lists KDE as being started in 1996 and Gnome in 1997 as a reaction to the Qt-licensing issues. BTW.
Hyuu zay zis as if it vas not a good sing? Ve are werry heppi to sjpeek ze inglisj zat ze rest of ze vorld sjpeekz.
If a company like RedHat or SUSE decided there was a sufficiently large market for a "trusted" distribution, wouldn't it be possible for them to go through "formal" procedures. Obviously, such a distro would never be cutting-edge, because of all the extra testing that needs to be performed. It's only if you try to look at all of "GNU/Linux" developement at the same time that you might say "anarchy rules". As soon as you get to the distros, you get far less chaos and far more control of what goes in. I think that such a thing would even be more "trustworthy" than closed source, because afterwards, you would be able to see all the source that went into the "trusted" distro.
It would be highly improbable to receive any living creatures from outside the solar system. One problem is that the travel times are _huge_ compared to inside the solar system, we're talking tens of millions of years. The other problem is that the speed at which such an object would impact on earth would be at minimum 5 times faster than a typical Mars rock (junk from outside the Solar System will have a speed of at least 72 km/s, the escape velocity from the sun at earth distance, an potentially several times faster still, if we hit it "head-on") This means it has to survive far harsher conditions on entering our atmosphere. The oldest known probable fossils on earth date from 3.5-3.8 billion years ago (formation of the solar system 4.5 billion years ago). Ironically, since Mars is smaller and further from the sun, it will have cooled more quickly and life may have developed on Mars and get transferred to earth... We may all be martians...
He's manipulating them this way :
- pick the part with the largest price differential between Mac en PIII (ie. Ram)
- add a ridiculous amount of it to the system
- quote the whole system price without nuances
the reason I call it "manipulation" is that the system presented is not a realistic system. Nobody in their right mind buys a computer outfitted with 1 Gig of memory unless it servers a very specific purpose (ie. large servers or people who have to edit really, really huge graphic files).
If you want, I could probably create the exactly opposite situation by looking for some fancy schmansy superduper Mac videocard costing 6000$ and putting that in place of the ATI Rage Pro, then claiming that the Mac was far more expensive then the PC.
I stand by the statement that this is "fudging the figures". Although the prices are technically accurate, they are extremely misleading.
RAM Type/Size.....1Gig SDRAM (4).........1GIG RDRAM (4)i gx3(scsi)
HardDrives..........18Gigx3(scsi).............18g
OS.........................MacOS 9........................Win98SE
Wow, that's real smoov, how you put in a GIG of ram for two OS-ses which really really don't need it. (maybe for Photoshop it *could* be useful in extreme circumstances, but really...)
And wouldn't you know, 1 GIG of RDRAM would set you back more than 5000$, so well over half the cost is in the ram. If you put in a more realistic 256 MB Ram (for anything but Photoshop), then the price of the Max drops by an enormous 700 bucks while the PC drops by a mere 4200 bucks.
If you say you want to use it as a server, then why OS 9 and Win98, both of which basically are USELESS as server OS's.
(BTW, if you go to a non-DELL company, offering Gigahertz Athlons, you can even use SDRAM-modules, reducing the price of an equivalent system further).
I don't care much for OS wars and stuff, but this kind of "Manipulating the figures" is something I really dislike.
But, the further you are from a planet, the lower the gravitational attraction will be, so the slower your acceleration to the planet. If you fall towards a planet from essentially infinity (just start a couple of light years out and hope there's nothing else nearby), you will very very slowly accelerate towards the planet. This acceleration will increase as you go nearer to the planet, albeit very slowly. It's only in the last part of the descent that the acceleration becomes reasonably high. This is where the term "Escape Velocity" comes from, this is the minimum speed away from the center of the planet you need to not fall back to the planet -ever-. For Earth's surface, it's about 12.7 km/s. If you started out twice as far away from Earth's center, you would to be going only a quarter of this speed to escape.
/. a couple of months ago.
The object you are trying to describe, where you reach the speed of light before hitting the surface, is called a black hole, and the point where escape velocity reaches 300,000 km/s is called the event horizon. (what happens below this is uncertain, we do know now that black holes really exist, but everything below the event horizon is still very much theoretical physics - although some of it has been verified experimentally, and there was a story about optical black holes - a sort of massless simulation of a BH on
Not trying to be pedantic, but the K6 has got an FPU (worse than the PentiumII but roughly on par with the Pentium and certainly better than the Cyrix/IBM model of similar clock-frequencies). What it doesn't have is MMX/3DNow/SSE stuff, which is useless on almost any kind of server anyway.
Actually, it would be completely useless to try to colonize other planets to reduce overpopulation on earth. Just consider it : Every year, about 70 million more people are born on earth then die. This means that just to keep our population stable at current levels, we would need to ship out this many people. This is close to 200,000 people per day, every day. How would you do this? Using rockets would be impossible, even the biggest regular rockets could only launch a couple of tens of people. Even if we had the technology to build space elevators, and we built say 5 of them around the equator, that would still mean lifting 40,000 people per elevator per day, and shipping them of of the top of the elevator. As it stands, we humans simply breed too fast to "orbit" us out of trouble. And, for the record, every time poverty was reduced somewhere, after a short while, birth rates dropped significantly. The solution for overpopulation is prosperity (although with prosperity tend to come other problems, like environmental pollution, which tend to offset the other gains...) Oh yes, it's a toughie awright...