Space is supposed to be at absolute zero. Anything directly in the sunshine heats up incredibly. Skylab overheated when one of its solar panels failed to deploy correctly, yet Apollo 13, in direct sunlight and in a lethal radiation zone, supposedly got cold. On the launch pad the ship is air conditioned from ground services . In space the ship is air conditioned powered by fuel cells. If you turn off that air conditioner the ship gets cold??.
At least that is what NASA's line of logic dictates.
Apollo 17's LEM sat on the Moon in direct sunlight for 75 hours straight. Without massive power and refrigeration units the only way to cool the LEM would have been with the explosive cooling of water. Many tons would have been necessary for that time period. The astronauts reported that the LEM's were "too cold to sleep in" How cold would your closed car be after 75 hours of direct sunlight??
The life support backpacks that the astronauts wore were supposed to cool them on the lunar surface by discharging water from a blowhole.
Conservative calculation of the water necessary to accomplish this, given standard metabolic heat and solar radiation, indicates that the backpacks had to be filled 40 % with water, allowing room also for an oxygen bottle, carbon dioxide scrubber, dehumidifier, water bladder for the cooling circuit and one for the dump water, a heat exchanger, a radio monitoring bodily function, a comms pack with power to reach Houston, and a battery to power all of this. Also for the cooling to be functioning, the water would need to be ejected from the blowhole regularly. This would have tremendous photograqphic effect given a virtual fountain spewing minute crystals of water in a near no gravity environment. NASA missed all 10,000 of those shots.
Further, NASA's own cutaway drawings of the backpack shows a water storage of about 0.43 gallons, almost enough for 27 minutes of operation at the impossible efficiency of 100%.
Yet NASA claimed 4 hours of remote LEM operation per astronaut.
skeeter
Originally posted by skeeterUmm, the earth would be at -18C were the greenhouse effect not in operation. The moon at a similar temperature. Like the earth, the moon has an atmosphere and some greenhouse effect will be in effect. The ability of the sun to increase the temperature of any surface or object decreases as a square of the distance from it. As the moon and earth are roughly the same distance from the sun, they'll be heated to roughly the same temperature.
Space is supposed to be at absolute zero. Anything directly in the sunshine heats up incredibly. Skylab overheated when one of its solar panels failed to deploy correctly, yet Apollo 13, in direct sunlight and in a lethal radiation zone, supposedly got cold. On the launch pad the ship is air conditioned from ground services . In space the ship is air condit ...[text shortened]... cy of 100%.
Yet NASA claimed 4 hours of remote LEM operation per astronaut.
skeeter
Oh, and whilst space is at absolute zero, it's also a vacuum and has little capacity to transfer heat. Heat is basically molecular motion - no atoms, no motion and no heat!
Originally posted by scottishinnzEh? So how does the sun's heat reach Earth? I thought radiant energy did not require moelcular transmission?
Oh, and whilst space is at absolute zero, it's also a vacuum and has little capacity to transfer heat. Heat is basically molecular motion - no atoms, no motion and no heat!
Originally posted by scottishinnzTemperatures in direct sunlight in space can be over 275 °Fahrenheit.
Umm, the earth would be at -18C were the greenhouse effect not in operation. The moon at a similar temperature. Like the earth, the moon has an atmosphere and some greenhouse effect will be in effect. The ability of the sun to increase the temperature of any surface or object decreases as a square of the distance from it. As the moon and earth are r ...[text shortened]... acity to transfer heat. Heat is basically molecular motion - no atoms, no motion and no heat!
http://www.nasaexplores.com/show_58_teacher_st.php?id=02122193000
Am I correct in assuming that even though heat can't travel through space (lack of motion), as soon as the sunrays get in contact with a surface (like a space suite) heat is generated? Or does it require an atmosphere of sorts? And if so, how come temperatures in direct sunlight in space can be over 275 °Fahrenheit (135 °Celsius)?
Originally posted by ivangriceradiant energy and heat are not the same thing. Heat is what happens when radiant energy, essentially a stream of photons, hits atoms, causing them to 'shudder'. It's the movement which is heat.
Eh? So how does the sun's heat reach Earth? I thought radiant energy did not require moelcular transmission?
heat radiates in all directions ... at a rate depending on the skin of the radiating body ... this cools things down in space, potentially to very low temperatures.
it also comes in fast from one direction ... that of the sun.
in space it is very easy to keep cool ... just put an umbrella between youself and the sun ... conversely incorrect placing of mirrors can blast the suns rays at you, causing overheating.
thermal problems aresimple and no problem.
Originally posted by skeeterskeeter dear,
Space is supposed to be at absolute zero. Anything directly in the sunshine heats up incredibly. Skylab overheated when one of its solar panels failed to deploy correctly, yet Apollo 13, in direct sunlight and in a lethal radiation zone, supposedly got cold. On the launch pad the ship is air conditioned from ground services . In space the ship is air condit cy of 100%.
Yet NASA claimed 4 hours of remote LEM operation per astronaut.
skeeter
Why would they turn off the cooling system when they are setting in direct sun light? Have you never sat in a car in direct sun light? It gets hot.
The fact that they were too cool is because they were unable to successfully and comfortably adjust the cooling system. It worked too well.
You fail to notice that the backpack system is A CLOSED LOOP system. Nothing is vented. It is a standard compression-decompression release system. JUST LIKE YOUR FRIDGE. You don't see the coolant escaping your fridge, DO YOU? I hope not. That stuff is dangerous.
OK, skeeter, here's a link that may help educate you a bit on your bizarre thermal energy conspiracy it concerns the "temperature" in space.
http://www.faqs.org/faqs/astronomy/faq/part4/section-14.html
Please try to discern the difference between a fact and a self-indulgent statement with no basis in reality, like your claim that space is at absolute zero.