Interestingly it is actually only about twice as hard to get away from Uranus. Thats a lot better than I expected. Maybe its because of the low density and the fact that you start out in the fluffy atmosphere. Escape velocity from a singularity with the mass of Uranus or Earth is of course infinite.
So far Earth is the only planet with free oxidiser because living things use solar energy to make oxygen. I have hopes for fossil oxidisers on Titan though.
I think it might be the process for when somebody leaves the company and their computer goes to a different person. I got a machine once with a whole lot of personal photos on it. I told the IT manager about it and he said all machines are supposed to be imaged between owners.
The business may not want to to that (say if they have a temp) because it may cost money per machine.
Do you mean chemically? In oxygen? Where are you going to find oxygen on Uranus? In water molecules I suppose but you still need a source of energy to crack the water which means fission, or preferable fusion power.
The atmosphere of Uranus is 83% hydrogen. If we can't turn that into fuel for a fusion reactor then we won't be operating in the atmosphere of that planet. So the planet has plenty of fuel, and fusion power is (as always) 50 years away.
Escape velocity is such that while humans could be landed on Neptune or Uranus they couldn't be lifted off without advanced fusion powered rockets.
Yeah, well don't forget about the gravity. If humans landed on those planets I doubt they'd be very interested in taking off again. Although they might make good frisbees from then on.
As cmowire pointed out gravity on most of these planets is not so great, with the exception of Jupiter where it is IIRC 2.5 g or so. On saturn it is just over a g and on Uranus and Neptune it is below one g. While their mass is huge their density is low so gravity is modest.
Escape velocity is such that while humans could be landed on Neptune or Uranus they couldn't be lifted off without advanced fusion powered rockets. I don't actually think the giant planets have much potential for us unless we find ways to exploit humungus amounts of mass. Applications like building ringworld and dyson spheres could require that much mass.
The moons of the giant planets will keep us busy for 1000 years at least.
I am not in the UK but most of the time I just google stuff these days. If it is a personal number somebody probably gave it to me so it will be in my PDA, which has space for thousands of numbers. If it is a business they probably have a web site or a directory listing which google indexes. I can get the white and yellow pages on line easier than I can get the phone book out of the cupboard. I think always on ADSL and 3G internet access makes all the difference.
I am an Australian but in 1997 I was in London staying with a friend. I wanted to find an internet cafe so I asked my host for a phone book. He pointed out how big a phone book would have to be for a city of 12 million people. I took his point and walked around at random and looking for the internet cafe, which had apparently moved.
Re:There was an early fax machine in the 1860s
on
Thomas Edison's Kindle
·
· Score: 2, Funny
Some of other Caselli's inventions were: an electrical marine torpedo which came back to the launching point in the event of missing the mark, an hydraulic press and an instrument that measures the speed of the locomotives.
A torpedo that comes back if it misses? What could possibly go wrong? This man was clearly a genius!
Ah good point. But for those purposes do you need new ones every year? My guess is the business will potter on for about ten years until the old people who currently used them stop buying stuff. Then advertising revenue will decline and they will go out of business.
I had a moment of cognitive dissonance when I was helping my mother move home. She loaded up the phone books and I said why not leave them here. She said her boyfriend uses them and I said what for? She looked at me like I was some kind of idiot. He uses them for looking up phone numbers.
A couple of days ago my wife and I were in the car going somewhere. A street near our house is narrow with parked cars on both sides. Suddenly this motorised wheelchair crosses the road, cutting us off. It is being driven by a disabled woman. So we get going again and turn left into the main road. Lights ahead are read so we join the queue. The woman in the wheelchair overtakes us on the left (we drive on the left here) on the road with a mobile stuck to her right ear. She starts to turn into a car park then stops, presumably because she can't get on the curb with small wheels and nearly gets rear ended by a car going past us on the left to get into the car park.
In 1948 Robert Heinlein wrote a story called Space Cadet. Early in the story the protagonist is lining for something and his mobile phone rings. He answers the call. Its his dad asking about something but he ends the call saying can't talk now I am in a crowd. You know RAH was a pretty good futurist and got a lot of technical things right, but some things wrong too. Few people today would end a mobile phone call because there were other people around.
Responding to questions about the incident, police said Ms Lucas, 30, was jogging about 100m to the east of the Hackney Rd bridge about 8.45am when she stopped to take a mobile phone call.
She scribbled a number on her leg - she did not have writing paper - and turned her back to the pram.
When Ms Lucas finished the telephone call and looked up, her child and the pram had vanished.
Asked if she might have heard a splash or the sound of the pram falling into water, Chief Inspector Mick Fisher said he did "not want to speculate on that".
Witnesses said Ms Lucas, fearing Leonardo had been abducted, was "hysterical" as she ran along the path toward the bridge.
"Someone took my baby in a pram, a red Mountain Buggy," Ms Lucas told witnesses.
Riding a bicycle to work I have seen half a dozen or so people cycling along in the dark without lights, hands off the controls and talking on a phone stuck to their ear. I always abuse them loudly so even if they don't care about the havoc they could create, the person on the other end may catch on.
I think every row of cubicles at my work should have a bucket of water for the storage of unattended ringing mobiles. Presumably the person at the other end assumes the owner of the phone can't hear the ring to they keep trying. First offence: I remove the back and the battery. Second offence: into the drink.
It occurred to me that the builders of dyson spheres may on sell their heat. Say they radiate at 250 kelvin. They allow a different species to build a big sphere around theirs which radiates at 150k. Then a different species buys that heat and radiates their own heat at 50k. Their sphere has the radius of the orbit of Neptune.
Yes, the spectrum may give it away, but we don't actually know what is natural in the universe. Maybe intelligence of a sort is natural and our models are wrong.
SF Laos doesn't have to "deal" (legally affiliated) with SF US: they just happen to download stuff they found on SF US website (just like anyone else).
If SF Laos serves content to Iran which the US doesn't want sent to Iran then the US will ask the Government of Laos if they are "with us or against us". Its a big decision to make.
If we do find them they're likely to be more intelligent than us, they may turn out to be hostile, and they may discover that we are tasty, or good speceship fuel, etc. They may be intelligent enough that we don't even appear sentient to them. I'm not sure I want us to find intelligent extraterrestrials.
You seem to share Hawking's delusion that more intelligence is an inevitable part of the progression of an intelligent species.
Which is clearly wrong. Crocodiles, for example are as smart as they need to be. I think early humans were trapped into a (say) software intensive architecture. They had these tools (fingers, eyes, etc) which could only be used for survival by a powerful brain. So there was selection pressure for intelligence, but only because our peripherals (so to speak) had previously developed into general purpose tools.
Not when it comes to export control. Believe me. If SF Laos deals with Iran then SF Laos can not deal with the US. Laos goes on the list of banned countries unless the Laos government closes SF Laos. Which they will do, more or less immediately.
Slashdot Mirror
... And if they offer their course online?
Or in second life?
If you want to avoid addiction, you'd better spend less than two hours per day on online entertainment!
Maybe I should set my sons Club Penguin account back to a one hour per day limit. He seems to have persuaded his mother to set it to three hours.
About four times as hard. KE=1/2 m v^2
Ah I forgot about that.
Thats easy:
Escape velocity of uranus: 21290 m/s
Escape velocity of earth: 11180 m/s
Interestingly it is actually only about twice as hard to get away from Uranus. Thats a lot better than I expected. Maybe its because of the low density and the fact that you start out in the fluffy atmosphere. Escape velocity from a singularity with the mass of Uranus or Earth is of course infinite.
So far Earth is the only planet with free oxidiser because living things use solar energy to make oxygen. I have hopes for fossil oxidisers on Titan though.
I think it might be the process for when somebody leaves the company and their computer goes to a different person. I got a machine once with a whole lot of personal photos on it. I told the IT manager about it and he said all machines are supposed to be imaged between owners.
The business may not want to to that (say if they have a temp) because it may cost money per machine.
Do you mean chemically? In oxygen? Where are you going to find oxygen on Uranus? In water molecules I suppose but you still need a source of energy to crack the water which means fission, or preferable fusion power.
The atmosphere of Uranus is 83% hydrogen. If we can't turn that into fuel for a fusion reactor then we won't be operating in the atmosphere of that planet. So the planet has plenty of fuel, and fusion power is (as always) 50 years away.
Escape velocity is such that while humans could be landed on Neptune or Uranus they couldn't be lifted off without advanced fusion powered rockets.
Yeah, well don't forget about the gravity. If humans landed on those planets I doubt they'd be very interested in taking off again. Although they might make good frisbees from then on.
As cmowire pointed out gravity on most of these planets is not so great, with the exception of Jupiter where it is IIRC 2.5 g or so. On saturn it is just over a g and on Uranus and Neptune it is below one g. While their mass is huge their density is low so gravity is modest.
Escape velocity is such that while humans could be landed on Neptune or Uranus they couldn't be lifted off without advanced fusion powered rockets. I don't actually think the giant planets have much potential for us unless we find ways to exploit humungus amounts of mass. Applications like building ringworld and dyson spheres could require that much mass.
The moons of the giant planets will keep us busy for 1000 years at least.
I am not in the UK but most of the time I just google stuff these days. If it is a personal number somebody probably gave it to me so it will be in my PDA, which has space for thousands of numbers. If it is a business they probably have a web site or a directory listing which google indexes. I can get the white and yellow pages on line easier than I can get the phone book out of the cupboard. I think always on ADSL and 3G internet access makes all the difference.
I am an Australian but in 1997 I was in London staying with a friend. I wanted to find an internet cafe so I asked my host for a phone book. He pointed out how big a phone book would have to be for a city of 12 million people. I took his point and walked around at random and looking for the internet cafe, which had apparently moved.
Can't you use this?
Some of other Caselli's inventions were: an electrical marine torpedo which came back to the launching point in the event of missing the mark, an hydraulic press and an instrument that measures the speed of the locomotives.
A torpedo that comes back if it misses? What could possibly go wrong? This man was clearly a genius!
Naturally, Australians got there first.
Clearly, Steve Jobs has foreseen my fiendish plan.
Ah good point. But for those purposes do you need new ones every year? My guess is the business will potter on for about ten years until the old people who currently used them stop buying stuff. Then advertising revenue will decline and they will go out of business.
I had a moment of cognitive dissonance when I was helping my mother move home. She loaded up the phone books and I said why not leave them here. She said her boyfriend uses them and I said what for? She looked at me like I was some kind of idiot. He uses them for looking up phone numbers.
A couple of days ago my wife and I were in the car going somewhere. A street near our house is narrow with parked cars on both sides. Suddenly this motorised wheelchair crosses the road, cutting us off. It is being driven by a disabled woman. So we get going again and turn left into the main road. Lights ahead are read so we join the queue. The woman in the wheelchair overtakes us on the left (we drive on the left here) on the road with a mobile stuck to her right ear. She starts to turn into a car park then stops, presumably because she can't get on the curb with small wheels and nearly gets rear ended by a car going past us on the left to get into the car park.
In 1948 Robert Heinlein wrote a story called Space Cadet. Early in the story the protagonist is lining for something and his mobile phone rings. He answers the call. Its his dad asking about something but he ends the call saying can't talk now I am in a crowd. You know RAH was a pretty good futurist and got a lot of technical things right, but some things wrong too. Few people today would end a mobile phone call because there were other people around.
Baby dies in Torrens tragedy
Responding to questions about the incident, police said Ms Lucas, 30, was jogging about 100m to the east of the Hackney Rd bridge about 8.45am when she stopped to take a mobile phone call.
She scribbled a number on her leg - she did not have writing paper - and turned her back to the pram.
When Ms Lucas finished the telephone call and looked up, her child and the pram had vanished.
Asked if she might have heard a splash or the sound of the pram falling into water, Chief Inspector Mick Fisher said he did "not want to speculate on that".
Witnesses said Ms Lucas, fearing Leonardo had been abducted, was "hysterical" as she ran along the path toward the bridge.
"Someone took my baby in a pram, a red Mountain Buggy," Ms Lucas told witnesses.
...and so on. Another moron with a mobile.
Riding a bicycle to work I have seen half a dozen or so people cycling along in the dark without lights, hands off the controls and talking on a phone stuck to their ear. I always abuse them loudly so even if they don't care about the havoc they could create, the person on the other end may catch on.
I think every row of cubicles at my work should have a bucket of water for the storage of unattended ringing mobiles. Presumably the person at the other end assumes the owner of the phone can't hear the ring to they keep trying. First offence: I remove the back and the battery. Second offence: into the drink.
It occurred to me that the builders of dyson spheres may on sell their heat. Say they radiate at 250 kelvin. They allow a different species to build a big sphere around theirs which radiates at 150k. Then a different species buys that heat and radiates their own heat at 50k. Their sphere has the radius of the orbit of Neptune.
Yes, the spectrum may give it away, but we don't actually know what is natural in the universe. Maybe intelligence of a sort is natural and our models are wrong.
Gotta call Larry Niven...
SF Laos doesn't have to "deal" (legally affiliated) with SF US: they just happen to download stuff they found on SF US website (just like anyone else).
If SF Laos serves content to Iran which the US doesn't want sent to Iran then the US will ask the Government of Laos if they are "with us or against us". Its a big decision to make.
I did not know that Steve Gutenberg wrote books. I thought he was just a skilled actor.
He's only a start because of the stonecutters.
How to detect a dyson sphere? Look for the waste heat. Will be bright in the infrared.
You mean, like a red dwarf, or a brown dwarf?
You seem to share Hawking's delusion that more intelligence is an inevitable part of the progression of an intelligent species.
Which is clearly wrong. Crocodiles, for example are as smart as they need to be. I think early humans were trapped into a (say) software intensive architecture. They had these tools (fingers, eyes, etc) which could only be used for survival by a powerful brain. So there was selection pressure for intelligence, but only because our peripherals (so to speak) had previously developed into general purpose tools.
Not when it comes to export control. Believe me. If SF Laos deals with Iran then SF Laos can not deal with the US. Laos goes on the list of banned countries unless the Laos government closes SF Laos. Which they will do, more or less immediately.