Everything at high speed is dangerous. And everything is space is at high speed.
Although speed is relative. |
It couldn't penetrate a space suit, could it?
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I'm sure spacesuits are designed with the thought that the outermost layer could be slashed or pierced.
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I ask cause I recently watched an episode of farscape were one of the main characters (john) had to jump out of a ship without a space suit and I'm curious if they got the timing and science right |
Pressure + cold = no chance.
Remember heat is caused when particles hit other particles, in space, even if there is light it doesn't mean there is heat. Even vast dust clouds - the primordial essence of nebulae - are only 40 or 50 K above absolute zero. |
That's the cause of pressure, not heat. As I said before, most heat loss on Earth is down to conduction, so the only important factor in space is heat radiation, the effect of which is slow and may well be countered by normal heat generation. In any case, your clothes would make the difference. A space walk dressed in tin foil would solve your temperature problem, insofar as there is one.
The breathing problem remains the number one issue. |
I think your mistaken there BM, partially, heat is caused by atoms colliding together or vibrating, pressure is the amount of force you place on something, greater pressure means more force on a smaller surface area. Surely I am reading your previous post wrong though, you must have already known that, it's the basis of astrophysics.
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So you side with the argument that if you can see sunlight...you'll probably roast to death. Why don't you go hover a few kilometres above Pluto for five minutes and see how hot it is.
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Heat, when the energy is in an object, does exist as excited atoms. They vibrate a lot. Collisions have no part in this, except for conduction. When one atom collides with another (or is simply next to it in an object), there is a transferring of energy. The hotter atom is now vibrating less, the cooler one is now vibrating more. This is how you get cold in the winter, or your beer warm in the summer (when in the shade). This transference always occurs, but eventually no net difference will result since all particles involved are at the same temperature. Heat is the end result of all forms of energy, and only useful to us when there is more of it in one place than another, since we can benefit from its transference from one place to another (all our energy comes from exploiting this). Once temperatures are the same, only the addition of more energy can change it. This is entropy. Eventually, everywhere will be the same temperature. This is the heat death of the universe. In space, a vacuum, conduction is extremely limited. There are a few sprinklings of atoms, but for our purposes they can be ignored. Your atoms vibrate with body heat, but the only conduction is to other atoms of your body, or clothes. Some briefly to the vapour of your boiled saliva and tears. The only real means of transmitting energy in space is radiation. Excited atoms release some of their energy regularly as photons. Long wavelength, the infra-red portion of the electromagnetic spectrum. Invisible to humans. Radiation in the entire spectrum is how stars shine. Radiation in infra-red is the primary means of heat loss in space. Tin foil reflects a good deal of this, except perhaps very short wavelength, so the photons will be reflected back to your body. :
But in Earth orbit, without the atmosphere, its pretty bad, particularly to your eyes. Unfiltered UV. |
I'm not at all enough of a physics buff to know about that, but what I do know is that there's nowhere for heat energy to escape to in space. Losing heat is plain not a problem.
EDIT: wah BM |
Ok, I understand your point BM, I completely forgot there's more than one type of heat. Ugh, I'm going to have to go and resit P3 now.
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Yeah, that bit doesn't make sense.
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weapons, including pulse rifles have a kick back because every action has an equal and opposite reaction, so by shooting the gun in one direction steers him in the other direction, it gives him a better chance of actually getting to the transport pod than jumping out and hoping. |
Man hits vacuum
Vacuum hits back |
Apparently you can live for two minutes in the vacuum of space if you are good at holding your breath.
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A gun (ignoring pulse rifles for the moment as they're, you know, impossible) shoots a bullet in one direction. At the same time, the bullet imparts an equal force on the hammer/back of the barrel. Similarly, burning gases may shoot out of a rocket's exhaust, but that's not what provides the force; it's the fact that they're burning inside the engine and pushing upwards. A rocket/bullet/energy pulse doesn't need an atmosphere to push against. It's alreay imposing a force on the thing it's being emitted from. |
did anyone hear about some alien ships near pluto that are heading to earth?
here are some pics i found of them,they can be even found on the star map where nasa updates it: http://metro-portal.hr/img/repositor...rod_pluton.jpg http://metro-portal.hr/img/repositor...nlo_pluton.jpg http://metro-portal.hr/img/repositor...nlo_pluton.jpg and the biggest one is 240km long :/ http://metro-portal.hr/img/repositor...irski_brod.jpg (artists impression) |
You got a source for that, poindexter?
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i couldnt find the exact same thing that was in croatian but i found something similar also saying that there are unidentified huge objects heading towards earth and are near pluto.
http://www.bombshock.com/aliens-and-...rds-earth.html |
I wouldn't imediately say it's false because I do belive in aliens and it is a possability that aliens could find a way to cross inter steller distances, however I shall remain skeptic right up to the point were they can get better pictures from official sources, perhaps a communication attempt
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If aliens are on their way to Earth...we are done for. An alien that can reach us has an understanding of science and physics that surpasses our own knowledge so much, if they were an antagonistic species our weapons would likely be made redundant.
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some scientists say that to them the travel already ended but for us it would take years for it to arrive,but as they predicted these space ships will arrive at 2012,who knows what type of civilization are they as the scientists say the biggest object heading towards earth is 240 km big :/
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It's the Annunaki come to save us from ourselves and take us away in their giant Ark ships while Scrabtrapman is left behind on the dying Earth.
That would annoy me so much. All my possessions would be forfeit... I mean, where do I plug in my Xbox on them ships? |
I wouldn't be left behind. =( You'd be to upset and you'd pack me into a travel bag and put me in with the luggage. Either that or rapture.
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If you do come, you'll have to leave your precious bees behind.
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That'll do it. I don't fancy its future genetic potential, though.
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It'll have some retard degenerate descendants somewhere down the line but...I can't think of any other way to hide the bees from the Annukai.
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*ANNUNAKI
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I'll make this bull speech about saving the animals cause we need a viable food source, and than I'll tell scrabtrapman were they stored the bees
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http://www.latest-ufo-sightings.net/...luto-will.html this is something more like i read in croatian,when they reatch mars ill buy a better telescope to observe :D
edit:i found somewhere that new crop circles started to appear looking like formations forming a map or something.... |
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yeah but who knows what type of communication devices are they using,mabe our communications to them look like stone age transmitters.One thing is why nasa cant find any transmitting signals in space,mabe they are using faster than light communication or something like that.
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