We wouldn't be able to build enough drilling plants on top of it to make any reasonable dent in the energy contained there. I agree that we would get plenty of usable energy from it, but we would not be able to stop the expansion.
Orbiting at Mach 25 is a fancy (non-scientific) way of saying fast. people go "oooh ahhh" when they hear something like that. And you are right, Mach is a local measure, and the sound speed decreases with altitude (not increasing as suggested by Artifakt). As density drops with altitude, so does the sound speed. That is why the shuttle achieves Mach 25 at the exosphere (re-entry only). Its going pretty fast and there are only a handful of molecules for every cubic meter.
Sound cannot travel in a vacuum. Sound needs molecules to transport sound waves. To determine the speed of sound, you need to know gas properties and temperature. By definition, a vacuum is space with no pressure (i.e. no molecules > molecules each contribute their own pressure, Dalton's Law), therefore no gas.
Well, if you need to shoot down a satellite, I suppose launching a missile from something that's already going at 13000mph is easier than launching it from the ground.
Why not just put a rocket on top of the something that's travelling 13,000 mph? Keeps the costs down.
but this would be more of a concept testing for the engine, with "making it practical to use" left as work for other people.
This is probably what it is for. Someone probably already has a practical use for it, but doesn't want to reveal what that practical use would be. They just need the engine. DARPA likes to do this, where they say, "Hey design some random crazy piece of equipment that you couldn't ever fathom using. The piece of equipment must be fully functional, and we don't plan on telling you what it is for in the end. Thanks."
The validity of the public debt of the United States, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion, shall not be questioned.
insurrection is in the first sentence...
and it isn't clear. it doesn't indicate what to do with debt owed to foreign governments. you could make the argument that obama was cleared as stated by the constitution to ignore foreign credit in favor of domestic credit... thus we would default on some loans but not others.
The major credit agencies should have cut when major factions of the Republican party started openly advocating a default. In violation of the 14th amendment, Section 4.
"Section 4. The validity of the public debt of the United States, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion, shall not be questioned. But neither the United States nor any State shall assume or pay any debt or obligation incurred in aid of insurrection or rebellion against the United States, or any claim for the loss or emancipation of any slave; but all such debts, obligations and claims shall be held illegal and void."
Everyone keeps saying this applies, but Section 4 of the 14th Amendment gives a bunch of language about insurrectoin and rebellion which makes it difficult to interpret. Jury is still out on whether or not this applies to our current situation, since our debt has largely been incurred due to domestic stupidity, rather than rebellion.
Weather predictions have been historically inaccurate. Why would anyone think that global warming or this new paper are any more accurate? We won't know that global warming is coming until it hits us, much like we won't know an ice age is coming until it hits us.
If there are only 5 then why did it take so long to find this rock? Is it becaue the sun is between us an it? If so then there could be some real intersting stuff at that lagrange point.
because the rock is 300 meters wide... space is a lot larger than that. Also the sun makes it difficult to see from the ground
I am surprised they haven't found this before. They are planning on installing satellites at L4 and L5, you would think they would figure out if there was anything there waiting on us.
The asteroid orbits one of the two Lagrangian points of stability of the Earth-Sun system
There are 5 Lagrange points. One on the other side of the sun, one on the other side of us, 1 ahead of earth in orbit, one behind earth in orbit, and one in between us and the sun.
The idea is that eventaully we will want a station in Geo synchronous orbit and that its cheaper to move this station from LEO to GSO than luanching parts up from earth. Not sure if this is true though.
Definitely not true... The amount of fuel required to move the ISS to GSO from LEO (26,000ish miles versus the 100-1200 miles it currently sits at) would be staggering. Keep in mind that it is a million pound object. At launch, the shuttle weighs almost 4.4 million pounds, but only weighs around 200,000 pounds in orbit. At best (really stretching it here), it would require 20 million pounds of fuel to move the ISS just a fraction of the 25,000 miles it needs to go in space using the same payload ratio as the shuttle. And you have to find a way to get that 20 million pounds of fuel into space. If the space shuttle were to complete this task, at 53,000 pounds of fuel (max payload shuttle can take), it would require 377 shuttle launches to get the fuel there. Each one of those shuttle launches would require 4 million pounds of fuel to get into LEO. Thats 1500 million pounds of fuel.
Really? I thought they attached a VASMIR ion engine onto the ISS for orbital correction maneuvers. Attach a few more, load up some fuel and go. You know, explosions not withstanding.
Orbital correction maneuvers are nothing compared to the delta v required to transfer the ISS into an orbit far enough away from earth to not cause problems. The VASMIR engines are really only good for high specific impulse any way (very efficient but with low thrust levels). The reason those are the orbital correction motors is for this reason, it requires much less fuel weight and the manuevers require relatively low thrust. Also, adding more engines is only going to add more weight, which will require more fuel, which will be more weight... so then you will need more engines, then more fuel for those engines... this gets out of control very quickly. Believe it or not, there is a reason they brought the space station into space in pieces and assembled it there. There isn't realistically enough propulsion to move an object that large more than a few kilometers at a time.
I'm not sure how it was back in the 80's but as a recent graduate (2010) and current Graduate Student in engineering, with the job field how it is now, you need minimum a 3.5 GPA to even consider getting a decent job straight out of undergrad. A masters is the only other way to really search for a job. Otherwise, you can really only count on 1 or 2 job offers coming out of college, both of which will involve some sort of CAD or low level programming. In my graduating class, i know of at least 3 people who should not have graduated but skirted some of the requirements because of solely who they knew. IMO that downgrades my degree. The Bachelor's degree is turning into a high school diploma.
How can replacing thousands of expensive centrifuges be cheaper than replacing the infected computers??!! Dude, WTF?!
Because the worm was designed to destroy the centrifuges. The worm fed signals to the centrifuges that made them operate beyond their operating capabilities, effectively destroying them
Not so much an "ocean"; the water is in the form of vapor, not liquid. It doesn't even look like a cloud, which is condensed water droplets. The density is most likely lower than the best vacuum we've ever pulled on earth. It's a lot of water, but a LOT of space.
So it's not really a large source of water, but rather a large gathering of water...?
They say this will cut down on crime, but criminals who don't want to get found will just use fake license plates, and then this just becomes another burden on the taxpayer. Honestly, I can't figure out why anyone would want to live in Massachussets or San Franscisco with the wacky laws they are implementing in those areas.
Cable still charges an arm and a leg. And personally, I prefer to watch a show from start to finish, one episode after another. Not really something you can do with cable which has commercials and you have to wait week to week for new episodes. Netflix still beats cable IMHO.
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We wouldn't be able to build enough drilling plants on top of it to make any reasonable dent in the energy contained there. I agree that we would get plenty of usable energy from it, but we would not be able to stop the expansion.
How do you think they get the robot to Mars?
Orbiting at Mach 25 is a fancy (non-scientific) way of saying fast. people go "oooh ahhh" when they hear something like that. And you are right, Mach is a local measure, and the sound speed decreases with altitude (not increasing as suggested by Artifakt). As density drops with altitude, so does the sound speed. That is why the shuttle achieves Mach 25 at the exosphere (re-entry only). Its going pretty fast and there are only a handful of molecules for every cubic meter.
good luck with that in the upper reaches of the atmosphere...
Sound cannot travel in a vacuum. Sound needs molecules to transport sound waves. To determine the speed of sound, you need to know gas properties and temperature. By definition, a vacuum is space with no pressure (i.e. no molecules > molecules each contribute their own pressure, Dalton's Law), therefore no gas.
Well, if you need to shoot down a satellite, I suppose launching a missile from something that's already going at 13000mph is easier than launching it from the ground.
Why not just put a rocket on top of the something that's travelling 13,000 mph? Keeps the costs down.
but this would be more of a concept testing for the engine, with "making it practical to use" left as work for other people.
This is probably what it is for. Someone probably already has a practical use for it, but doesn't want to reveal what that practical use would be. They just need the engine. DARPA likes to do this, where they say, "Hey design some random crazy piece of equipment that you couldn't ever fathom using. The piece of equipment must be fully functional, and we don't plan on telling you what it is for in the end. Thanks."
The validity of the public debt of the United States, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion, shall not be questioned. insurrection is in the first sentence... and it isn't clear. it doesn't indicate what to do with debt owed to foreign governments. you could make the argument that obama was cleared as stated by the constitution to ignore foreign credit in favor of domestic credit... thus we would default on some loans but not others.
The major credit agencies should have cut when major factions of the Republican party started openly advocating a default. In violation of the 14th amendment, Section 4.
"Section 4. The validity of the public debt of the United States, authorized by law, including debts incurred for payment of pensions and bounties for services in suppressing insurrection or rebellion, shall not be questioned. But neither the United States nor any State shall assume or pay any debt or obligation incurred in aid of insurrection or rebellion against the United States, or any claim for the loss or emancipation of any slave; but all such debts, obligations and claims shall be held illegal and void."
Everyone keeps saying this applies, but Section 4 of the 14th Amendment gives a bunch of language about insurrectoin and rebellion which makes it difficult to interpret. Jury is still out on whether or not this applies to our current situation, since our debt has largely been incurred due to domestic stupidity, rather than rebellion.
if you are looking at "trends", then you aren't actually predicting anything. Predicting requires physical models, not data.
Weather predictions have been historically inaccurate. Why would anyone think that global warming or this new paper are any more accurate? We won't know that global warming is coming until it hits us, much like we won't know an ice age is coming until it hits us.
Where would the Sun get egg whites? If you mean glare, you'd be wrong.
Oops! Haha.
This asteroid, because of its orbit, will rise precisely four hours before the sun. So you've got over 2.5 hours of dark in which it would be visible.
This depends entirely on where you are in the world. And I restress that the asteroid is only 300 meters wide. It would still be difficult to see.
yes but the sun would also give a glair on any ground-based telescopes...
If there are only 5 then why did it take so long to find this rock? Is it becaue the sun is between us an it? If so then there could be some real intersting stuff at that lagrange point.
because the rock is 300 meters wide... space is a lot larger than that. Also the sun makes it difficult to see from the ground
I am surprised they haven't found this before. They are planning on installing satellites at L4 and L5, you would think they would figure out if there was anything there waiting on us.
The asteroid orbits one of the two Lagrangian points of stability of the Earth-Sun system
There are 5 Lagrange points. One on the other side of the sun, one on the other side of us, 1 ahead of earth in orbit, one behind earth in orbit, and one in between us and the sun.
To give a 1 million pound object the delta v required to move much beyond a few hundred miles beyond earths orbit is still enormous
The idea is that eventaully we will want a station in Geo synchronous orbit and that its cheaper to move this station from LEO to GSO than luanching parts up from earth. Not sure if this is true though.
Definitely not true... The amount of fuel required to move the ISS to GSO from LEO (26,000ish miles versus the 100-1200 miles it currently sits at) would be staggering. Keep in mind that it is a million pound object. At launch, the shuttle weighs almost 4.4 million pounds, but only weighs around 200,000 pounds in orbit. At best (really stretching it here), it would require 20 million pounds of fuel to move the ISS just a fraction of the 25,000 miles it needs to go in space using the same payload ratio as the shuttle. And you have to find a way to get that 20 million pounds of fuel into space. If the space shuttle were to complete this task, at 53,000 pounds of fuel (max payload shuttle can take), it would require 377 shuttle launches to get the fuel there. Each one of those shuttle launches would require 4 million pounds of fuel to get into LEO. Thats 1500 million pounds of fuel.
Really? I thought they attached a VASMIR ion engine onto the ISS for orbital correction maneuvers. Attach a few more, load up some fuel and go. You know, explosions not withstanding.
Orbital correction maneuvers are nothing compared to the delta v required to transfer the ISS into an orbit far enough away from earth to not cause problems. The VASMIR engines are really only good for high specific impulse any way (very efficient but with low thrust levels). The reason those are the orbital correction motors is for this reason, it requires much less fuel weight and the manuevers require relatively low thrust. Also, adding more engines is only going to add more weight, which will require more fuel, which will be more weight... so then you will need more engines, then more fuel for those engines... this gets out of control very quickly. Believe it or not, there is a reason they brought the space station into space in pieces and assembled it there. There isn't realistically enough propulsion to move an object that large more than a few kilometers at a time.
They figured this out like 8 months ago...
I'm not sure how it was back in the 80's but as a recent graduate (2010) and current Graduate Student in engineering, with the job field how it is now, you need minimum a 3.5 GPA to even consider getting a decent job straight out of undergrad. A masters is the only other way to really search for a job. Otherwise, you can really only count on 1 or 2 job offers coming out of college, both of which will involve some sort of CAD or low level programming. In my graduating class, i know of at least 3 people who should not have graduated but skirted some of the requirements because of solely who they knew. IMO that downgrades my degree. The Bachelor's degree is turning into a high school diploma.
How can replacing thousands of expensive centrifuges be cheaper than replacing the infected computers??!! Dude, WTF?!
Because the worm was designed to destroy the centrifuges. The worm fed signals to the centrifuges that made them operate beyond their operating capabilities, effectively destroying them
Not so much an "ocean"; the water is in the form of vapor, not liquid. It doesn't even look like a cloud, which is condensed water droplets. The density is most likely lower than the best vacuum we've ever pulled on earth. It's a lot of water, but a LOT of space.
So it's not really a large source of water, but rather a large gathering of water...?
They say this will cut down on crime, but criminals who don't want to get found will just use fake license plates, and then this just becomes another burden on the taxpayer. Honestly, I can't figure out why anyone would want to live in Massachussets or San Franscisco with the wacky laws they are implementing in those areas.
Cable still charges an arm and a leg. And personally, I prefer to watch a show from start to finish, one episode after another. Not really something you can do with cable which has commercials and you have to wait week to week for new episodes. Netflix still beats cable IMHO.
then they will simply look for them elsewhere like dodging cars, chasing dragons, and running from cops