Front page of the Wall St Journal has a big drawing of asteroid 2005 YU55, which crosses earth's orbit and came within 201,000 miles of earth (inside the Moon's orbit) Pretty science fictiony for the staid old Wall St Journal.
This one missed.
Question: what should we do when we detect one that's gonna hit us? The only thing that might do some good, it to nuke it. Good big nuke, close up, might blow it into gravel. Or it might break it up into a dozen pieces. But the pieces keep coming. What causes more damage, one really big hit, or a dozen smaller hits?
Do any of those ICBM's have the oomph to boost a big nuke up that high? These asteroids are small and dark and hard to see, so they will be real close before we spot them. No time to build a special rocket, we would have to use something off the shelf. That's an ICBM that's been standing silo alert for decades. Or possibly a satellite launcher from Space-X.
If we have enough delta-V to do a rendezvous and land on the thing (heh, works in the movies) we could set a big nuke on one side of it it. Set it off, and that rock is gonna move. Trouble is, it may not move all that fast, which means we gotta nuke it when it's far out there, to give it time to move far enough to miss the earth.
Do we have any rockets with that sort of delta-V?
Tuesday, November 8, 2011
Monday, November 7, 2011
What do you lead with?
Tonight and last night The Newshour led with the Herman Cain sexual harassment story. Where as Fox News, put the story on "page 2", after other lead stories. Looks like the Newshour wants to torpedo Herman more than Fox does.
Internet censorship bill in Congress
US rep Lamar Smith (r -Texas) is supporting a bill to allow the Dept of Justice to shut down any website it wants to. No trial, no nothing, if DOJ wants the site off the internet, bang, it's gone.
This measure is the darling of Hollywood, 'cause they want to use it to "prevent piracy".
Rep Smith has accepted a few hundred thou from the entertainment industry.
What does it cost to buy a US congressman? Not much apparently.
This measure is the darling of Hollywood, 'cause they want to use it to "prevent piracy".
Rep Smith has accepted a few hundred thou from the entertainment industry.
What does it cost to buy a US congressman? Not much apparently.
News from the People's Republic of Cambridge
Sunday, November 6, 2011
Strange Obit in The Economist
The Economist wrote an obit for Dennis Ritchie, who died October 12. The obit writer was so ignorant as to fail to mention that Dennis Ritchie is the Ritchie of Kernighan and Ritchie, "The C Programming Language", a slim paperback book owned and revered by every programmer on earth. The book is so basic and so well known that it goes by the name of "K&R" in the programming world.
Then the obit writer makes a few wild claims. "C fundamentally changed the way computer programs were written". Not quite so. That honor belongs to FORTRAN which goes back to the early 1950's. FORTRAN was the first widely accepted higher level language and made portable (will run on more than one brand of computer) programs possible. It was so popular that all competing computer companies were obliged to offer a FORTRAN compiler on their machines.
C came later, 1960's, from Dennis Ritchie and Ken Thompson at Bell Labs. C caught on and became wildly popular because it was a vastly better FORTRAN than FORTRAN was. Not that C could do anything that FORTRAN couldn't do, but programming in C was infinitely easier. C swept away the myriad of pit falls, gotcha's and spaghetti coding practices of FORTRAN. I can still remember the pleasures of doing it in C after years of struggling along in FORTRAN.
C had a lot of great features, foremost among them was manual, K&R. This thin book was clear and lucid and above all short. Everything you need to know is in it, well organized and so well written you could read it for pleasure. Compared to the massive, wordy and opaque manuals that came with other computer languages, The C Programming Language was pure poetry and contributed mightily to the success of C.
Today practically all commercial programming is done in C. So in honoring Dennis Ritchie we are honoring a man who created modern computer programming, not single handedly, but with co workers. Dennis didn't do all the work, but he did do a lot of the work.
Then the obit writer makes a few wild claims. "C fundamentally changed the way computer programs were written". Not quite so. That honor belongs to FORTRAN which goes back to the early 1950's. FORTRAN was the first widely accepted higher level language and made portable (will run on more than one brand of computer) programs possible. It was so popular that all competing computer companies were obliged to offer a FORTRAN compiler on their machines.
C came later, 1960's, from Dennis Ritchie and Ken Thompson at Bell Labs. C caught on and became wildly popular because it was a vastly better FORTRAN than FORTRAN was. Not that C could do anything that FORTRAN couldn't do, but programming in C was infinitely easier. C swept away the myriad of pit falls, gotcha's and spaghetti coding practices of FORTRAN. I can still remember the pleasures of doing it in C after years of struggling along in FORTRAN.
C had a lot of great features, foremost among them was manual, K&R. This thin book was clear and lucid and above all short. Everything you need to know is in it, well organized and so well written you could read it for pleasure. Compared to the massive, wordy and opaque manuals that came with other computer languages, The C Programming Language was pure poetry and contributed mightily to the success of C.
Today practically all commercial programming is done in C. So in honoring Dennis Ritchie we are honoring a man who created modern computer programming, not single handedly, but with co workers. Dennis didn't do all the work, but he did do a lot of the work.
Saturday, November 5, 2011
Firewall, or is it a ring fence
With Greece sliding down the tubes, and the rest of the EU running around crying out "The sky is falling, the sky is falling", newsies on NPR and at The Economist keep agitating for a "firewall" (American speak) or a "ringfence" (European speak) around Greece to "prevent the contagion from spreading".
I wonder what they are talking about? Do they mean a great big sugardaddy who will step in and guarantee that all lenders to Greece and every other shaky country will get paid off in full and nobody will ever loose any money?
That would be nice, but neither the Americans nor the Chinese have that much money, and even if they did, they are not inclined to spend it on Europe. Nobody else in the world is big enough or well heeled enough to be a creditable sugardaddy.
The fundamental problem with Greece is nobody in their right mind is gonna lend them any more money. They are broke, owe more than they can ever pay, and still want to borrow more to cover their government spending. Their economy, never very good, is not growing, and doesn't throw off enough cash to pay their way. What kind of "firewall" can change that?
Then come the other shaky European countries. They aren't as bad off as Greece, yet, but everyone of sense can see where they are headed. Already they have to pay 5 and 6 percent for money while Germany and America can borrow for under 3%. As confidence wanes, they are going to find it harder and harder to borrow money. Soon it will become impossible.
Again, what sort of "firewall" will convince people to lend to deadbeats?
Or are we just hearing naive newsie's wishing for Santa Claus?
I wonder what they are talking about? Do they mean a great big sugardaddy who will step in and guarantee that all lenders to Greece and every other shaky country will get paid off in full and nobody will ever loose any money?
That would be nice, but neither the Americans nor the Chinese have that much money, and even if they did, they are not inclined to spend it on Europe. Nobody else in the world is big enough or well heeled enough to be a creditable sugardaddy.
The fundamental problem with Greece is nobody in their right mind is gonna lend them any more money. They are broke, owe more than they can ever pay, and still want to borrow more to cover their government spending. Their economy, never very good, is not growing, and doesn't throw off enough cash to pay their way. What kind of "firewall" can change that?
Then come the other shaky European countries. They aren't as bad off as Greece, yet, but everyone of sense can see where they are headed. Already they have to pay 5 and 6 percent for money while Germany and America can borrow for under 3%. As confidence wanes, they are going to find it harder and harder to borrow money. Soon it will become impossible.
Again, what sort of "firewall" will convince people to lend to deadbeats?
Or are we just hearing naive newsie's wishing for Santa Claus?
Friday, November 4, 2011
Dances with Dragons George RR Martin
It's the latest and fifth in the Game of Thrones/Fire and Ice saga. It's thick, and takes some time to read. It ends like the first four books of the series, all the good guy protagonists get killed, and the bad guys are still alive and ready for use in the next book. Actually I think one or two of the Starks are still sort of alive at the end, but the rest have bought the farm.
If you have read the previous Fire and Ice books, you will want to read this one, just to learn what happens, but toward the end I found myself just skimming hoping to get to where something happens. I'm afraid Mr. Martin has been reading too many of the Robert Jordan fantasies which just go on and on and nothing ever gets accomplished. Good old Tolkien, who invented the genre, at least made things happen. At the end of the trilogy the ring was thrown in the fire and the dark lord destroyed. Tolkien's modern imitators don't do that sort of thing anymore, the story just rambles on and on and never seems to get anywhere.
If you have read the previous Fire and Ice books, you will want to read this one, just to learn what happens, but toward the end I found myself just skimming hoping to get to where something happens. I'm afraid Mr. Martin has been reading too many of the Robert Jordan fantasies which just go on and on and nothing ever gets accomplished. Good old Tolkien, who invented the genre, at least made things happen. At the end of the trilogy the ring was thrown in the fire and the dark lord destroyed. Tolkien's modern imitators don't do that sort of thing anymore, the story just rambles on and on and never seems to get anywhere.
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