er - the Vulcan was fairly state of the art at the time...
223 posts • joined 11 Sep 2008
er - the Vulcan was fairly state of the art at the time...
The Lunar module lower sections (descent stage) were left behind on the lunar surface when the astronauts returned to lunar orbit. These were designed to act as "launchpads" for the ascent stages. The original plan for the ascent stages was to be abandon them in lunar orbit after return to the Command module and this was done for Apollos 10 and 11. However from Apollo 12 onwards it was decided to de orbit the ascent stages and impact them on the surface to create artificial "Moon quakes" which could be recorded on the seismometers that were left on the surface of the moon. The only two that this did not happen with were Apollo 13 and Apollo 16. Apollo 13's LM was bought back from the Moon as a "lifeboat" and burned up in the Earth's atmosphere over the Pacific Ocean after separation from the command module. With Apollo 16 control of the LM was lost at jettison so the impact manoeuvre was abandoned an the LM left in lunar orbit.
For the vehicles left in lunar orbit their reprieve was short lived. One of the discoveries of the Apollo programmes was that the Moon's gravity field is not uniform, there seem to be "mass concentrations" that cause the field to vary significantly at different locations. This becomes difficult for plotting a spacecraft's orbit (indeed this is how they were found in the first place). Because of these variations the ascent stages eventually crashed into the surface of the Moon.
Hope this of use to you.
How do we know it has not already arrived...
Not quite accurate I'm afraid. Venus has had quite few spacecraft visit it, the latest being ESAs Venus Express. This number has included a number of landers and atmosphere probes.
Unfortunately, those of us who are sighted are tied to a diurnal cycle of light and dark, some quite strongly. One of the things recognised recently is how blue coloured light (such as produced in monitors and LCD TV screens) can trigger the wake up response in humans, causing sleep problems for those using screens late at night.
Track by Steve Hackett on Spectral Mornings
- which James Kirk fell off at the beginning of StarTrek 5.
Guy Fawkes mask icon needed back...
Ah, the Aston Martin Necronomicon edition...
That pic of a white and orange thing looks more like a parachute to me, the balloon was transparent.
Careful, Newton was actually being sarcastic with that expression...
Always easier to apologise afterwards than to ask permission?
We have been teaching units on Network security for the last 5 years as part of the Level 3 BTEC security FE, funny the Government doesn't mention that!
It was used a lot in Star Cops too.
+1 for radio play reference - the one, true, Hitch-Hikers.
This might give you an insight.
I found this when I was researching holographic HUDs to see if there is any connection to the Holovision. I wouldn't be at all surprised if these people have had a big input to the device.
Be careful about dismissing the "holographic" claim here. Current aircraft HUDs have holographic optical components as part of the glass plate that the pilot looks through. They improve the collimation of the devices (allows the user to focus on the outside world and still read the display) and the reflectivity for the plate, thus reducing the power required by the display. One of the things about holographic HUDs is that some of them are curved panels and as such the width of the view is much improved.
It is not inconceivable that this technology has been applied here, it would certainly help with some of the points raised concerning power usage, so describing them as holographic would be an accurate labelling.
No analysis, just good old family fun and it was too.
Up vote for working in the biz!
You are right, there is a limit to continued fuelling/defueling but this applies to consecutive attempts to launch. If this flight attempt does not happen today then they will have to wait 3 or 4 days before they try again to allow the rocket's tanks to settle down, I believe that NASA did say Sunday or Monday. Surprisingly Aluminium tanks are fairly forgiving of this kind of treatment and can be used for quite a lot of such cycles before being considered scrap. The main issue would be metal fatigue due to the cycling. This is the problem that did for the early Comet airliners but they have the addition of square corner windows which exacerbated the problem. Once this had been solved we now see Aluminium tubes (airliners) being cycled many times a day without failure and can have cycle numbers going into 10's of thousands.
>I wonder if the cooling required for nuclear reactors could involve the void?<
Yes, you would use radiators on the shadow side of the spacecraft to radiate the heat into space. Heat management in the vacuum of space is actually quite a tricky thing. With no air or other fluid to take the heat away (like with a CPU heatsink) you have to use radiation and the more heat you generate the larger the radiator has to be. Consequently radiators for a nuclear reactor similar in output to that in a nuclear submarine will have to have a large area, in the order of several hundred to a few thousand square metres, of radiating surface.
This will only be needed for the power generating reactor though, the nuclear rocket engines would be cooled by the propellant (typically hydrogen) being fed into them picking up the reactor heat. The heated (and expanded) propellant would then go blasting out the nozzle of the engine producing thrust and carrying the heat away too.
Hope this is of use/interest
The rock (and that's what it is) looks interesting but I'm more intrigued by the smoothness of the rest of the terrain around it. Whole areas of the comet have this smooth melted look, quite unlike any other body we have seen in space so far.
Is it a form of erosion? Dust drifts? Melting?
Can't wait to see what it's like really close up.
Called Launchpad and turned up in OS7.
But they don't look as cool as the old school Crays did.
Don't know, it looks a bit tricky downrange over Florida, Cuba and the rest of the Carribian.
There were plans to control the stage and manouvure it but it was not equiped with legs so I think a landing test was not being considered for this flight. Bear in mind the first time they tried to land a stage it had no legs and went into a spin that destroyed it. It was thought at he time that the legs would act as fins to stabilise the rocket during it's descent and this seems to have been borne out in the subsequent attempts.
CST 100 does come down on land, using airbags to cushion the landing.
SpaceX have recently been testing a small rocket engine whose thrust (combustion) chamber has been 3d printed. The comments were that they had been able to make a hugely efficient engine because the component's shape was able to adopt a more sophisticated and complex shape that would be difficult to fabricate using typical "metal bashing" techniques. On test the engine has performed very well indeed.
A 4 notepad and a Parker pen?
Damn Lester, you are attracting some serious talent to this project.
Er - no. One of the reasons that this islet keeps being occurpied is that this maintains a claim of British sovereignty to Rockall and the waters between it and the mainland and all that implies (fishing rights, minerals, etc.). So the RSPB might have something to say.
Ah, quantum humour. You don't know if it's funny or not until you observe it...
All these comments about fabois are based on the assumption that Apple fans buy everything and anything with the fruity logo, not always true though. Apple have had it's share of non or slow sellers too you know. The iPhone 5c recently comes to mind.
Besides, the true fanbois will be after the more expensive, top of the range kit, you know, the stuff people like me buy second hand after a few years when the next shiney comes out. I don't think I've bought a new computer in the last 15 years and they have all been quite capable for the time.
I must admit I still prefer my music on a CD. I do use a digital player when I'm away from home but it's copies of my disks that are loaded onto it. I like to have disks as my master copies and make the digital ones I need. I also like the better quality sound I get from the disks when played on a good CD player.
I don't think I'm alone in this.
I still prefer to have my music on CD. I use an MP3 player for on the move but I like to be able to have the CD as the master copy and make digital copies as I need. Also the CD sounds better on a good player and I really do like that.
The Disney bit has never bothered me, they are behind the Marvel branded movies after all and I don't hear people complaining about these much. Disney are not daft, there are a number of films made by Disney that have different labels on them, quite grown up some of them.
Yes, I've noticed this too.
Interestingly an older friend said said to me when I turned forty "you're now entering the period of your life when people you know die". I see what he meant now.
If you think about it the first wave of (modern) IT users will be starting to creep into this category, those of us who cut our teeth on Commodore PETs and Apple 2's. We're now moving to pensionable age, certainly can be Saga-louts.
As this generation moves into old age all of the clichés of age being a barrier to technological competence will become not true (if not actually redundant), and this is only going to accelerate from now on.
It won't be long before we see our first middle aged "digital natives" (someone born into the IT age).
Andrew (age 53 and counting)
An excellent analysis. I have been using IOS7 since it's release and, apart from a short period of adjustment at the start, I have to say I have no complaints. I'm not an artist or designer so I can't offer any informed comment on design but I mostly find the UI to be quite unnoticeable in use, which I should think would surely be the aim of UI designers.
Yes for the film, in Clarke's original book they were friends.
Ah this is Lego, the toughest substance in the known universe (we've still got bricks from 50 years ago!).
Wait! Could this be the basis for dark matter?
We still have an establishment like that in Derby, R F Potts (Bob's to most of us).
Wonderful place and worse than Maplin's for great stuff. Even the Maplin's in Derby refers people to Bob's if they don't have it.
Just done a quick check on Space.com and it reports that the money is to start the planning process for a mission that may launch in 2025. The final cost for such a mission would probably come in at about 40 Billion over 10 years.
I think this fantasticly exciting. If we can put a signal into a nerve imagine an electronic bypass system that reconnects a broken spinal column.
If I was a tetraplegic I would voulunteer for experiments like a flash. Even it didn't work it would be valuable to know and an honour to take part.
I hear there's a spacecraft bound for Jupiter needing a computer..
The piezo electric method could be the way using the motion of a blink. This would compress the circuit regularly, generating a smidgin of power and a capacitor in the circuit could store and smooth the power pulse into a current.
+1 for the "Man of Steel, Woman of Kleenex" ref. I laughed till I cried when I first read that. If you want a real mad experience try reading it aloud to an audience, as good as anything by Mr B Connerly...
Wristwatches came in because pulling a pocket watch was too much hassle in a busy environment. Pulling a phone out my pocket is just as inconvienent when I'm busy and I think a lot of people find that. I don't use a chonograph (not even digital), just a plain "old-school" watch that shows the date as well as time. Much more convienient than fumbling in my pocket and pressing buttons to find out the time or date.
As for "tech-watches", not my cup of tea but who knows.
As usual, Arther C Clarke got in there first, Check out his seventies novel "Imperial Earth" where the plot hinges on the 22nd Century economy of Titan supplying Methane across the Solar System for spacecraft propellant.