That's sort of correct, but the beauty of the Jovian moons is that they revolve around a planet that does have an atmosphere. So in principle they can use Jupiter's atmosphere to slow down to a speed that allows for slower passes around the moons (a la Galileo probe). I would think they'd be able to figure out how to get matched into a moon orbit so they can approach at a slow speed and only have to spend fuel to fight the moons gravity.
Jupiter's atmosphere is not as helpful as you might think. It will put you into a transfer orbit for a fly-by, but actually getting into a low orbit around those moons would require a huge rocket burn.
Its not the "moons gravity" that is the problem, but their velocity. Rocketry is all about the delta-V. I'm no orbital mechanic, so I rely on reading the charts such as this one:
You can see that even with aero-braking (on sections marked with red arrows), it is still far easier to land on Titan than the Jovian moons. But don't take my word. NASA has so far landed only on Titan in the outer solar system.
Note also that it is way easier to escape the solar system, than to approach the sun, as the Parker Solar Probe is doing.
Trump is not to blame for the closures. But he is to blame for making so many promises he could not keep. Not that he is the first politician guilty of this.
The sad thing is that so many people chose to believe Trump could reverse the tides of automation, and reopen coal mines with pick and shovel instead of 10,000 ton excavators. Trump voters are definitely not idiots, but they want to believe so much that there are easy answers. That Trump won with such promises says a lot about how bad his opponents were, from both parties.
more interesting to land on, other than Mars. Some of the moons of Jupiter, for example. I guess that's just too hard right now...
The problem with reaching the Jovian moons is that they lack atmosphere for aero-braking, which means you need to send not just a small probe, but a big rocket to stop it. A much better candidate for landing is Titan, the big moon of Saturn. Such a mission has already been done, launched 21 years ago, and landed in 2005:
He did pontificate against human colonization and terraforming of Mars. (He didn't exactly say he was "against" it: was he said was that he thought it would never happen). But he said he was in favor of human exploration of Mars.
200 years ago, some idiots were saying the same about Antarctica, that it was only good for explorers and scientific bases with temporary residents. They could not imagine how our advanced technology would make vast greenhouses and permanent cities possible. Also the terra-forming process is well under way, and should be showing substantial progress over the next century,
We make Blackberries - do they call us the Blackberry maker? No. We make Nokia phones - do they call us the Nokia supplier? No. We make Nintendos, Xboxes and Playstations, but do they call us the console supplier? No. But you build one fucking iPhone...
It's sad what political correctness is doing to the English language. We used to have a perfectly good words for "participants with tetraplegia" or "persons living with visual disability".
Making a profit is what tells you that the value of the service being offered exceeds the cost of providing the service.
Sorry, that only applies in particular simple and ideal circumstances, like a single goods transaction. Real economics is far more complicated. You sound like you think you understand economics. Even people who know a thousand times more still don't really understand it.
As a simple example here, is the problem of fixed vs marginal costs. If you set ticket price by total cost divided by number of trips, it will be much more than the marginal cost of one more passenger. Can you see the problem with that? If you want efficient allocation of resources, ticket should be closer to marginal cost.
The only role of government in creating these types of systems is in getting over the initial payment hump (the construction of the lines and purchase of the buses/trains), and coordinating the payments of the millions of riders. Once you start justifying supporting such systems via general tax funds instead of fares, you're justifying government waste.
Again, you are talking as if you understand the first thing about economics. As if it was simple and obvious. What makes ignorant people speak so confidently? Now care to explain nuclear fusion? You wouldn't try would you, but somehow everybody is an expert on economics.
How many city transport systems make a profit? It is perfectly normal for subways to only get a fraction of their income from ticket sales. And for governments to fund the system from taxes, just like the roads.
What is wrong with the NYC and state governments that they don't want to fund a transport system worthy of a great city?
It was not a cuss name exactly. It was merely an initialism than *hinted* at a cuss name. That's the joke.
Like DVD, KFC or BP, the term BFR doesn't formally stand for anything. Not at least until Miss Prim and Proper started calling it the Big Falcon Rocket. Hard to believe she is an engineer and not an accountant.
Musk just called it the "BFR" in a reference to the BFG weapon in the Doom games, many years ago. Only recently did Gwynne Shotwell start calling it the Big "Falcon" Rocket, because... trying to sound dull and respectable.
I always found it hilarious that no one in the movie "Hidden Figures" was shown smoking, when in reality the whole crew would have been puffing like old steam engines.
Probably not in mission control though. The only photos I saw of smoking there were the after-mission cigars.
And "Hidden Figures" cares little for facts. They show gender and racial segregation at NASA that did not exist. OK, there were was a little bit: "Katherine (then Goble) was originally unaware that the East Side bathrooms were segregated, and used the unlabeled "whites-only" bathrooms for years before anyone complained.[19] She ignored the complaint, and the issue was dropped." https://en.wikipedia.org/wiki/...
Step 1) Access and steal the official comprehensive database of all existing CP. Step 2) Offer it up for bids to darkweb pedos Step 3) Retire to Tahiti
If it was that easy, it would be copied so many times there was no profit.
Presumably, they use some kind of fingerprint or hash to match the images, not just index them. This would only allow a low-res thumbnail to be extracted.
But where do you draw the line? The problem with these stories is, you don't know where they are talking, on the spectrum from physical abuse of babies, to topless tabloid page-3 girls.
The only way people will move to Mars is if something is actively driving them away from earth.
The way we're polluting the Earth, it could still happen.
We could pollute earth beyond the most dystopian imagination, and it would still be better than living on Mars. Sorry. I find the Antarctica comparison convincing. Sure we want a scientific base, and a few rich tourists will go. But nobody wants to live there in a permanent colony. It'll be easier and more useful to colonise the bottom of the ocean than Mars.
Much like the phrase "Jack the Ripper" was the creation of journalists of the time, but it's now the most-understood way to refer to that particular serial killer. The "DB Cooper skyjacking" is a similar phrase.
Thanks folks. As suspected the word appears unique to American newspaper headlines of the period (1970s), and a movie title. It is clearer now to this confused foreigner. I guess the DB Cooper case, and attached term, must be a s famous in the US as Jack the Ripper elsewhere. But it is still not in common usage today.
Wouldn't you be confused by an article that used "ripper" in place of "murderer"? Sure you get from the context that there was a murder, but be trying to figure out what specifically a "ripper" was. It would not be good writing.
I presume you are in your 20s to have not encountered this word,
No, but not American. I just tried googling the 9/11 attacks, and every article I saw used the words "hijack" and "hijacker" not "skyjacker", so I still think "skyjack" is a bit of informal regional slang, or at least archaic by this century. Dictionaries contain a lot of obscure words with better alternatives.
I kept reading, waiting for an explanation, but not given, so googled DB Cooper (no link!?) and found out they mean "hijacking". Please speak English, not tabloid-headline made-up words.
Escape speed, in any direction other than straight at the ground, is enough to make sure you never fall down again
A rocket could fly straight up until reaching escape velocity, but that would be a very bad idea as you would be fighting gravity the whole time. In reality, rockets fire their engines as close to horizontal (perpendicular to gravity) as practical.
Slashdot Mirror
That's sort of correct, but the beauty of the Jovian moons is that they revolve around a planet that does have an atmosphere. So in principle they can use Jupiter's atmosphere to slow down to a speed that allows for slower passes around the moons (a la Galileo probe). I would think they'd be able to figure out how to get matched into a moon orbit so they can approach at a slow speed and only have to spend fuel to fight the moons gravity.
Jupiter's atmosphere is not as helpful as you might think. It will put you into a transfer orbit for a fly-by, but actually getting into a low orbit around those moons would require a huge rocket burn.
Its not the "moons gravity" that is the problem, but their velocity. Rocketry is all about the delta-V.
I'm no orbital mechanic, so I rely on reading the charts such as this one:
https://www.reddit.com/r/space...
You can see that even with aero-braking (on sections marked with red arrows), it is still far easier to land on Titan than the Jovian moons.
But don't take my word. NASA has so far landed only on Titan in the outer solar system.
Note also that it is way easier to escape the solar system, than to approach the sun, as the Parker Solar Probe is doing.
Whether Trump is to blame or not,
Trump is not to blame for the closures. But he is to blame for making so many promises he could not keep.
Not that he is the first politician guilty of this.
The sad thing is that so many people chose to believe Trump could reverse the tides of automation, and reopen coal mines with pick and shovel instead of 10,000 ton excavators.
Trump voters are definitely not idiots, but they want to believe so much that there are easy answers. That Trump won with such promises says a lot about how bad his opponents were, from both parties.
more interesting to land on, other than Mars. Some of the moons of Jupiter, for example. I guess that's just too hard right now...
The problem with reaching the Jovian moons is that they lack atmosphere for aero-braking, which means you need to send not just a small probe, but a big rocket to stop it. A much better candidate for landing is Titan, the big moon of Saturn. Such a mission has already been done, launched 21 years ago, and landed in 2005:
https://en.wikipedia.org/wiki/...
How soon we forget. And let's not also forget the Russian landings on Venus has some success.
No, he didn't.
He did pontificate against human colonization and terraforming of Mars. (He didn't exactly say he was "against" it: was he said was that he thought it would never happen). But he said he was in favor of human exploration of Mars.
200 years ago, some idiots were saying the same about Antarctica, that it was only good for explorers and scientific bases with temporary residents.
They could not imagine how our advanced technology would make vast greenhouses and permanent cities possible.
Also the terra-forming process is well under way, and should be showing substantial progress over the next century,
30fps comment. You are blind if you cannot see and feel the difference between 30 and 60.
I guess he is thinking of movies, rather than FPS games or desktops.
I did not like The Hobbit in 48fps, but maybe that was just the 3D making it bad.
Why?
Just cos.
We make Blackberries - do they call us the Blackberry maker? No. ...
We make Nokia phones - do they call us the Nokia supplier? No.
We make Nintendos, Xboxes and Playstations, but do they call us the console supplier? No.
But you build one fucking iPhone
It's sad what political correctness is doing to the English language. We used to have a perfectly good words for "participants with tetraplegia" or "persons living with visual disability".
Making a profit is what tells you that the value of the service being offered exceeds the cost of providing the service.
Sorry, that only applies in particular simple and ideal circumstances, like a single goods transaction. Real economics is far more complicated.
You sound like you think you understand economics. Even people who know a thousand times more still don't really understand it.
As a simple example here, is the problem of fixed vs marginal costs. If you set ticket price by total cost divided by number of trips, it will be much more than the marginal cost of one more passenger. Can you see the problem with that? If you want efficient allocation of resources, ticket should be closer to marginal cost.
The only role of government in creating these types of systems is in getting over the initial payment hump (the construction of the lines and purchase of the buses/trains), and coordinating the payments of the millions of riders. Once you start justifying supporting such systems via general tax funds instead of fares, you're justifying government waste.
Again, you are talking as if you understand the first thing about economics. As if it was simple and obvious. What makes ignorant people speak so confidently? Now care to explain nuclear fusion? You wouldn't try would you, but somehow everybody is an expert on economics.
How many city transport systems make a profit?
It is perfectly normal for subways to only get a fraction of their income from ticket sales. And for governments to fund the system from taxes, just like the roads.
What is wrong with the NYC and state governments that they don't want to fund a transport system worthy of a great city?
Pay a couple of big fat sweaty people to sit in it farting and burping for a couple hours.
I believe the Chinese solution traditionally involves fish heads, but durian fruit imported form SE Asia is becoming more popular.
It was not a cuss name exactly. It was merely an initialism than *hinted* at a cuss name. That's the joke.
Like DVD, KFC or BP, the term BFR doesn't formally stand for anything. Not at least until Miss Prim and Proper started calling it the Big Falcon Rocket. Hard to believe she is an engineer and not an accountant.
Musk just called it the "BFR" in a reference to the BFG weapon in the Doom games, many years ago. ... trying to sound dull and respectable.
Only recently did Gwynne Shotwell start calling it the Big "Falcon" Rocket, because
I always found it hilarious that no one in the movie "Hidden Figures" was shown smoking, when in reality the whole crew would have been puffing like old steam engines.
Probably not in mission control though. The only photos I saw of smoking there were the after-mission cigars.
And "Hidden Figures" cares little for facts. They show gender and racial segregation at NASA that did not exist. OK, there were was a little bit:
"Katherine (then Goble) was originally unaware that the East Side bathrooms were segregated, and used the unlabeled "whites-only" bathrooms for years before anyone complained.[19] She ignored the complaint, and the issue was dropped."
https://en.wikipedia.org/wiki/...
Archival photo of the NASA drug enforcement team:
https://www.hq.nasa.gov/pao/Hi...
Step 1) Access and steal the official comprehensive database of all existing CP.
Step 2) Offer it up for bids to darkweb pedos
Step 3) Retire to Tahiti
If it was that easy, it would be copied so many times there was no profit.
Presumably, they use some kind of fingerprint or hash to match the images, not just index them. This would only allow a low-res thumbnail to be extracted.
But where do you draw the line? The problem with these stories is, you don't know where they are talking, on the spectrum from physical abuse of babies, to topless tabloid page-3 girls.
"stereo-typically"
What's with the hyphen?
I think I did it without thinking, to make the red squiggly line go away. Stoopid spellchecker.
I remember when it used to be conservatives who stereo-typically had no sense of humour and got offended easily.
The only way people will move to Mars is if something is actively driving them away from earth.
The way we're polluting the Earth, it could still happen.
We could pollute earth beyond the most dystopian imagination, and it would still be better than living on Mars. Sorry.
I find the Antarctica comparison convincing. Sure we want a scientific base, and a few rich tourists will go. But nobody wants to live there in a permanent colony. It'll be easier and more useful to colonise the bottom of the ocean than Mars.
The real solution to both skyjackings and school shooting is to simply repeal all the gun laws, and let the good guys go armed in public.
Have you never seen a Hollywood Western?
Much like the phrase "Jack the Ripper" was the creation of journalists of the time, but it's now the most-understood way to refer to that particular serial killer. The "DB Cooper skyjacking" is a similar phrase.
Thanks folks. As suspected the word appears unique to American newspaper headlines of the period (1970s), and a movie title.
It is clearer now to this confused foreigner. I guess the DB Cooper case, and attached term, must be a s famous in the US as Jack the Ripper elsewhere. But it is still not in common usage today.
Wouldn't you be confused by an article that used "ripper" in place of "murderer"? Sure you get from the context that there was a murder, but be trying to figure out what specifically a "ripper" was. It would not be good writing.
Even Fox News has high enough standards to use the proper word:
https://www.foxnews.com/us/fre...
Some other US sources use "skyjack" in the headline, but hijack afterwards.
I presume you are in your 20s to have not encountered this word,
No, but not American. I just tried googling the 9/11 attacks, and every article I saw used the words "hijack" and "hijacker" not "skyjacker", so I still think "skyjack" is a bit of informal regional slang, or at least archaic by this century. Dictionaries contain a lot of obscure words with better alternatives.
I kept reading, waiting for an explanation, but not given, so googled DB Cooper (no link!?) and found out they mean "hijacking".
Please speak English, not tabloid-headline made-up words.
Here is the wikipedia page: https://en.wikipedia.org/wiki/...
Interesting story.
go fast enough horizontally so that when you fall towards the earth, you continuously miss.
I wonder if Douglas Adams knew anything about orbital mechanics?
Escape speed, in any direction other than straight at the ground, is enough to make sure you never fall down again
A rocket could fly straight up until reaching escape velocity, but that would be a very bad idea as you would be fighting gravity the whole time.
In reality, rockets fire their engines as close to horizontal (perpendicular to gravity) as practical.
See these diagrams of orbital transfers:
https://en.wikipedia.org/wiki/...