/sci/ - Science & Math

>>4471610
>>we can make a huge leap of faith
However, we cannot ignore the laws of thermodynamics.

>>They could be blasting it off in a narrow beam somewhere for some sort of intergalactic communication device.
lasers aren't 100% efficient and computers must turn energy into heat. Heat must be generated and radiated, even with 94% carnot efficiency.

>>4471608
le sigh...
http://www.projectrho.com/rocket/spacewardetect.php#id--There_Ain't_No_Stealth_In_Space

>>3963148
there ain't no stealth in space:
http://www.projectrho.com/rocket/spacewardetect.php

Fluorocarbons are more dense and viscous than air and thus more difficult to breath, not to mention the difficulty removing CO2:
http://en.wikipedia.org/wiki/Liquid_breathing

That being said, why should our astronauts need to have inefficient lungs in the firstplace? Why not just temporarily collapse the astronauts lungs, and directly oxygen the blood?
http://arxiv.org/abs/0806.3792

Then you can immerse your astronauts into a fluid with the same density as the human body.

That tethered counterweight makes a pretty tempting target to shoot at...

hey /sci/

serious question here about stelth in space. As you may or may not know generally is believed that there is no stealth in space. At least for spacecrafts there is none.
I'm somehow lacking the proper knowledge about rocket science so the question is:
Is there any chance that a missle can be practically stealth? Not fully invisible, just hard enough to detect that its worth to dump the money on it. And no jamming or other active countermeassures.

(Heating up space is a no go too)

http://www.projectrho.com/rocket/

That website sums it all up.

Basically, realistic space warfare is shitty and boring.

>>1538968
Troll or not, I may as well explain why this belief is wrong, this is /sci/ after all.

The problem reside in "how are you going to keep the heat from flowing back"
This is not a "sort" of battery where you put as much "heat/energy" as you can until you have to liberate it.

When it come to transfer of heat we can only transfer it into a fluid and store it in a tank made of material that resist the heat and don't transfer too much heat.

The fact the pump will heat itself by doing so is why we would better link whatever is heating by convection to the tank directly.
This only work if somehow every single cm² of the hull don't let heat go through. We have yet to discover a matter than can do that.

Saying that it's stealth depend of whatever the situation ask for but it's already far from what people would like to see.

Just in this thread we've go from "Sulaco Badass Marine transport" (that hide in front of the sun) to "small powerless drone with no humans aboard that drift for month without moving to deliver electronic warfare"

But as long as we call that "stealth" people still believe someone find a way around.