172 posts • joined Thursday 11th September 2008 10:21 GMT
Re: Moving South
Iceland sits at the "pivot point" of the Mid Atlantic ridge, the line of tectonic sea floor spreading that's pushing America away from Africa and Europe. Esentially Iceland is being split apart so it's volcanoes are being caused by a different mechanism.
To get an idea of what's happening have a look at this;
Re: 50 things to do before you die...
Shouldn't that be "SHORTED"?
Re: which allows the male users to have virtual sex
depends on the programming...
ClarisWorks - God! I would love to have that back!
It may not have been as well featured as Office but it had enough to make it very useful and it's integration between the tools was so sweet.
I want it back, as it was, right now!
BTW Claris Homepage was quite sweet too. Definately needed to be updated but very usable.
I made a nice little one out of a 35 mm film pot once. Pin hole in the base and a tracing paper screen across the open top, projected a lovely little image onto the screen. Nicely ironic too.
However, top marks to this bloke. A little pricey perhaps but it is getting the idea of 3D printing out there to another bunch of people.
Re: They have to call the colony ship "Ark Fleet Ship B"
What was that, a faulty spacesuit? Too bad, got to clean it out now.
Re: I'm surprised
Probably the best beer in the Solar System?
It may not be too spectacular an image but it's absolutely bloody brilliant that we have taken these images from a spacecraft, orbiting another world.
Bit of a traffic jam
After making a fix on the software, Cygnus' controllers were asked to delay the next attempt to dock up until after the Soyuz docking had taken place. If they hadn't both of the vehicles would have arrived at the station about the same time.
Barnes Wallis would be proud of you all, geodetic structure and a Swallow wing plan - brilliant!
I had to watch the video without sound so you may have answered this already. When you test fly Vulture 2 will it be under radio control or are you going to try the autopilot? (or both even)
Re: Small launcher space port - Thunderbirds are go!
But (as has been said before when we discussed Skylon) Britain is in the wrong place on the globe. If we want to launch to equatorial orbits we have to launch over Europe, not good for dropping stages or other problems. Our best option is Ascension Island, slap on the equator and a couple of thousand miles of sea before you hit Africa.
Re: I've ordered a 5C
Skoda seems to be more reliable at the moment...
Re: They just don't build 'em like they used to.
With respect, they still can build'em. There is a rover on Mars that was supposed to only work for 3 months, it's now in it's twelth year.
We got to see this flying!
Michelangelo said "Every block of stone has a statue inside it and it is the task of the sculptor to discover it."
Now it seems to be literally true (although in plastic!).
Well done to all concerned, this is proving to be fascinating.
Re: Originals were great?
Just a little?!
Re: Maybe Crewman Daniels was shot backwards in time again?
Funny you should mention Star Trek, in 1980 there was a "Star Trek Maps" set published which included a navigation booklet. This discussed using pulsars and quasars as triangulation beacons for navigation, quasars becourse these were so far away that they would appear "fixed" on the sky compared to pulsars which are nearer and so would have a detectable proper motion. The manual even gave the equations you could use to plot your position in space!
My set are nicely tucked away in an envelope in my attic 8-)
Re: If he's an expert...
A good idea but complicated by the environmental considerations.
An example. The two Voyager probes to the outer planets (and beyond) were based on the design of the highly successful Mariner series of probes used in the sixties, in fact the the Voyagers were once known as Mariner Jupiter. The main similarities were the basic spacecraft frame, then the changes started to make the craft so different that they were given a new name. The main differences were because of the fact that the craft needed to operate so far away from the Earth and the Sun and the Jovian radiation environment.
The design of Curiosity could be used as a starting point but would have to be altered substantially for the Jovian/Europan environment. Cold would be a major problem, for example. Mars may be a cold place but the temperature out at Jupiter is extreeme by Martian standards. The Jovian radiation environment, as mentioned in the article, is incredibly severe, any kit built for Mars would have to be rebuilt to withstand this radiation.
Hope this helps.
Re: Why bother
Not so limited, perhaps.
I recently bought a new music system and it has DAB as it's default receiver choice. I set it up and it seems to be quite effective. I think it's true to say that more and more HiFi systems are equiped with DAB straight off the bat so we will probably see the same kind of take up that occured with digital TV when Freeview digital tuners became built in to new TVs, a default switchover.
I am aware of the argument that states that the dedicated music system will die out as more music moves on line. I'm not convinced by this, I feel that there will continue to be a demand for seperate music systems as there are quite few people out there who still don't use online music providers or radio for various reasons. I myself still prefer the quality of sound produced by CD's over MP3 (not really explored FLAC yet, a bit inconvenient to use) so for the time being a dedicated music system still has a place in our house.
Yes, most of the US air defence requirement is handled by F16's, and if they feel like projecting a bit more force they also have F15C's. Both are mature aircraft and should be cheaper to run than the F22 (esp. the F16).
Glad someone got in with this observation.
Re: Look at da pwetty lights
OK, pseudo-rocket scientist lecture mode on.
You get the diamond effect when the pressure of the exhaust in rocket and jet engines and the ambient atmospheric pressure do not quite match, the terms are under expanded for ambient pressure lower than exhaust and over expanded for ambient pressure higher than exhaust. The effect is actually a supersonic shockwave and you would hear it a crackling in the engine noise (The engine of a Tornado gives a very good example when it's reheat is engaged).
For a rocket engine nozzle this occurs because the shape of the nozzle has to be optimised for the atmosphric pressure it is operating in. For a rocket designed to go from sea level to vaccuum (as Space Shuttle main engine did) it is neccessary to decide which condition the engine is going to spend most of it's operating time and design the nozzle accordingly.
This means that the engine may not be running at it's most efficient at a certain point in it's flight and for the Shuttle this was at launch, as boosters provided much of the impulse to get the vehicle off the ground and through the thickest part of the atmosphere. When these boosters had been used up and jetisoned the main engines were then operating in a high altitude environment that they were most efficient at.
Looking at the Chinese Long March picture I think we see the same kind of thing, a core stage that will fly to quite high altitude and optimised to fly at this lower atmospheric pressure, being supplimented with booster stages which are optimised to work best at ground level to get the vehicle off the pad and to higher altitude.
Right, pseudo- rocket scientist lecture mode off!
I think this is a reasonable explaination of this phenomena but if anyone can add anything to it I would be interested.
Re: Look at da pwetty lights
Space Shuttle main engines used to show Mach diamonds as well, but you have to look closely - oxy/hydro flames are almost invisible.
Re: But I don't wear a watch either...
I think it depends on what you do as much as personal choice. I like having a watch on my wrist as it is a convienient way for me to keep track of things, I teach and time management in class is very important. It's also good for me when out and about as I don't like getting my phone out in public too much.
Still, one day I'll do a "Peter Fonda", throw it away and ride off (see Easy Rider if you don't know what I'm on about).
The chances of anything coming on Mars...
And what does AManFromMars have to say about this?
Oh, that's alright then.
Re: Define "drilling"
Ah, misread article. Point noted.
Re: Define "drilling"
Also, it is worth remembering that the later Apollo flights had core sampling drills with them too.
There are quite a few of us "more mature" readers out here and we don't take kindly to being tarred by this brush (well I don't anyway).
Oy! Less about the age!
Re: Spider Robinson covered this a few years ago
Stephen Baxter has also played with this idea in the "Malifant" series of stories (Space, Time, Origin and Phase Space - especially Phase Space).
Re: Camera watching me, watching them...
Blob of Blu-Tak should do the job well.
Re: The Apple what?
I will agree with Mr Lewis here, I do think this is an indication of the Reg readership. Well, I am going to add some more fuel to the fire. As well as being a faithful follower of El Reg I have also been a subscriber to Which for the last twenty years. Over the years I have found these people quite reliable when they produce tests and comparisons. Ok, I agree that they may not be as technically inclined as the commentards here but that's not their audience. The one thing that keeps cropping up when they they test laptops, desktops, tablets and smartphones is that Apple keeps coming up near the top of their recommendations, if not the top.
It's not all unbridled praise from Which though, they do criticize Apple for a number of points that will be familiar to the Reg readership, particularly cost and upgrade ability of the recent consumer items. But it is noticeable that Apple kit fares well in their direct comparisons of kit.
As a whole though it does tend to recommend Apple products to a wider audience than the Reg readers, an audience that may be looking for a simpler experience with their computing kit and may not have a problem about such ideas as a "walled garden" (in fact they may even appreciate it as means of providing a level of security for their devices).
Now, I can see the reaction to this already. "Which are Apple shills/apologists", etc. Knowing the Consumer Association (the organisation that produces Which) I don't think so, they are fiercely independent and brook no nonsense when it comes to that kind of thing.
My position on this?
Neutrality with regard to tech, I have to work with Windows, Apple and Ubuntu boxes and I can see the ups and downs of all three platforms (but that's another post...). But, as I said, I do find Which to be reliable, I have used a lot of their recommendations when buying washing machines, TVs, DVD recorders and other stuff over the years and have not been disappointed (I have also taken their switching services advice and am quite happy with it). So I cannot ignore their comments over Apple.
If you want to call me a Which shill, that's ok, I've done well by them over the years.
True, Google has had bit of a booting over tax recently (though I have to admire their honesty over it!) but they have been supporting computing based activities in the UK for quite some time - look at their support for Bletchley Park.
While this can be seen as trying gain some good publicity after bad, I do think this is honestly meant by Google.
Re: nice sizzle reel, anyway...
Actually, Bernal Sphere is the colony design (conceived by J D Bernal in 1929!). The cylindrical design of colony comes from Gerard K O'Neill in 1976, in his book The High Frontier: Human Colonies in Space. His Island 1 concept used the Bernal Sphere as it's starting point.
A Dyson sphere is a structure that totally encloses a star as a means to fully exploit the energy given off by the star and to provide living space. Larry Niven used this as the jumping off point for his Ringworld concept as he felt this was more practical!
Sources (if you are interested in following up);
Bernal Sphere; http://en.wikipedia.org/wiki/Bernal_sphere
O'Neill Cylinder; http://en.wikipedia.org/wiki/O'Neill_cylinder
Dyson Sphere; http://en.wikipedia.org/wiki/Dyson_sphere
Larry Niven's Ringworld ( and a good description of Dyson sphere); His essay "Bigger Than Worlds", published in many places but in my collection in "Playgrounds of the Mind", 1991, Tor Books.
Re: Fifteen years earlier
Maybe so, but SpaceX have only flown this three times so far, Delta Clipper had a quite a few over several years! Give SpaceX their time and I think you will see something quite impressive.
I agree, not to see proof but just to see how it works. Things like this fascinate me.
The natural world is full of engineers, at all levels!
Re: If Obama had not grounded the Shuttle...
Er - no, shuttles could not be launched into polar orbits like the one the Korean satellite is in.
BTW, the shuttle grounding started with GWB, Obamha just followed through with it.
Re: This seems a bit mixed up...
Had a look at the orbital parameters of the bird earlier. It's perigee (lowest point in it's orbit) is 505 km (about 300 miles). That means it has a fair orbital life before it will reenter the atmosphere, probably about 10 years give or take 2. As was mentioned, it'll be tracked and any conflicts will be handled by moving the affected satellite out of the way if possible. The biggest worry is that the Korean satellite will fall to pieces before it's orbit decays. Then it becomes a much more difficult object to predict as there could be debris that can't be tracked properly and as the pieces bump against each other here could be slight changes in orbits to account for, not much of a change but the error will build up over time. I think the biggest worry for me would be any propellant tanks rupturing, that could have the effect of shredding the satellite and we would be looking at a cloud of debris that would spread out further the longer it stays in orbit.
Hope this helps.
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