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Bullet Magnet 06-17-2011 08:13 PM

Everything at high speed is dangerous. And everything is space is at high speed.

Although speed is relative.

mr.odd 06-17-2011 08:23 PM

It couldn't penetrate a space suit, could it?

Wings of Fire 06-17-2011 08:28 PM

I'm sure spacesuits are designed with the thought that the outermost layer could be slashed or pierced.

LDG519 06-17-2011 10:05 PM

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What are the best conditions in space supposed to be? Slightly less freezing cold? Not quite as vacuum-y?

no dust particals or any high speed object hitting you, somewere were your getting hit by sunlight so slightly less freezing.

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

STM 06-18-2011 02:19 AM

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.

Bullet Magnet 06-18-2011 05:50 AM

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.

STM 06-18-2011 08:12 AM

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.

Wings of Fire 06-18-2011 08:21 AM

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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.

TVTropes provides answers for people who can't be bothered trawling through wikipedia.

STM 06-18-2011 09:00 AM

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.

Bullet Magnet 06-18-2011 09:15 AM

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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.

Yeah, and the force placed on an object accomplished by moving atoms. In a volume of gas, such as we might find in an atmosphere, the molecules or atoms are moving about in random directions and bouncing off of each other and objects. All the gaseous molecules rebounding off of you are responsible for the atmospheric pressure you experience. They are what inflates a balloon, since the pressure inside the balloon is greater than the pressure outside, more molecules are bouncing off of the inside than the outside, so the outward force is the greater one until it is counteracting by the elastic force of the rubber. When more of the molecules are moving in one general direction than any other, you have wind, in which the pressure on one side of an object is greater than the other sides, which, if the force is greater than that of friction or gravity on that object, results in movement. Things blow around.

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.

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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.

If the sun emitted its photons parallel, ie a laser, you would, should you stray into the beam. But the sun's radiation, for lack of a better word, radiates. It's intensity drops off in accordance with the inverse square law. At pluto it would be only slightly (perhaps immeasurably) warmer than in the shadow of the Earth in Earth orbit.

But in Earth orbit, without the atmosphere, its pretty bad, particularly to your eyes. Unfiltered UV.

Wings of Fire 06-18-2011 09:17 AM

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

STM 06-18-2011 09:32 AM

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.

MeechMunchie 06-18-2011 01:44 PM

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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

I love that scene. My favourite space scene ever. They must've had BM-types working on that show because so far as I know the details are all perfect.

LDG519 06-20-2011 01:52 PM

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I love that scene. My favourite space scene ever. They must've had BM-types working on that show because so far as I know the details are all perfect.

I like how he used the pulse gun to steer himself to the transport pod

MeechMunchie 06-21-2011 08:29 AM

Yeah, that bit doesn't make sense.

LDG519 06-21-2011 01:54 PM

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Yeah, that bit doesn't make sense.

why doesn't it?

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.

Wings of Fire 06-21-2011 02:18 PM

Man hits vacuum

Vacuum hits back

STM 06-21-2011 02:23 PM

Apparently you can live for two minutes in the vacuum of space if you are good at holding your breath.

Nate 06-21-2011 05:44 PM

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Man hits vacuum

Vacuum hits back

Newton's third law doesn't work like that. If it did, rocket ships couldn't work.

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.

Scraby 07-29-2011 08:10 PM

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)

Strike Witch 07-29-2011 09:21 PM

You got a source for that, poindexter?

Scraby 07-29-2011 10:35 PM

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

LDG519 07-30-2011 01:13 AM

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

STM 07-30-2011 03:32 AM

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.

Dixanadu 07-30-2011 05:08 AM

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If aliens are on their way to Earth...we are done for.

They'll bargain with our leaders to share our precious resources or they'll bombard the planet.

Manco 07-30-2011 05:12 AM

This seems appropriate.

LDG519 07-30-2011 06:23 PM

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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.

I wouldn't necicarily say thier too much more advanced, it might just be a space probe from a nearby star system, or these aliens might live extreamly longer than us making the hundreds of years in transit not as long for them, or they could be advanced in travel yet still have low tech weapons, the possabilities are endless

Scraby 07-30-2011 07:56 PM

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 :/

Dixanadu 07-31-2011 03:35 AM

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?

STM 07-31-2011 05:14 AM

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.

Dixanadu 07-31-2011 08:15 AM

If you do come, you'll have to leave your precious bees behind.

Bullet Magnet 07-31-2011 08:42 AM

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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

You got a good source for that, poindexter?

STM 07-31-2011 09:02 AM

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If you do come, you'll have to leave your precious bees behind.

No, I'll put a fertile queen in a matchbox and take a packet of sugar.

Bullet Magnet 07-31-2011 09:07 AM

That'll do it. I don't fancy its future genetic potential, though.

STM 07-31-2011 09:24 AM

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.

Dixanadu 07-31-2011 07:43 PM

*ANNUNAKI

LDG519 07-31-2011 11:46 PM

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

Scraby 07-31-2011 11:51 PM

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....

LDG519 08-01-2011 12:00 AM

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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....

crop circles are always manmade, if aliens wanted to come in secret they'd know better than to leave a big crop circle were they landed, and if they didn't want to come in secret they would fly in plain sight, broadcast messages and all that

Scraby 08-01-2011 12:09 AM

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.