How Close to the Sun?

Mr Badger said:
So why don't astronauts come back to Earth with a nice tan then?
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Interesting... especially about the Moon, that always looks cold to me, didnt even think it would be hot.

So basically the air in space is hot then, sort of like how the air is always hot in Dubai or something. Now I thought space would be freezing cold.

In reality then, we wont really be able to live on Mars as its further away and probably a lot colder than we think. Funny how its red though, its that colour association that makes me think, sod Mars that would be hot to walk on.
 
mlbtheshow said:
Interesting... especially about the Moon, that always looks cold to me, didnt even think it would be hot.

So basically the air in space is hot then, sort of like how the air is always hot in Dubai or something. Now I thought space would be freezing cold.

In reality then, we wont really be able to live on Mars as its further away and probably a lot colder than we think. Funny how its red though, its that colour association that makes me think, sod Mars that would be hot to walk on.
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Suarez7 said:
HQoCxsT.gif
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I dont know why you get funny over it?

Its a genuine question, if its too simple for you to take part in.. then dont.

Space and stuff is something I havent learned about, didnt bother in school as its for nerds and never bothered after. Im not a big TV watcher of stuff like Science and I dont read at all, as books are boring.

So I get info on things I dont know about from the net, primarily asking questions on forums as I cant be bothered reading articles etc as I just switch off.
 
mlbtheshow said:
I dont know why you get funny over it?

Its a genuine question, if its too simple for you to take part in.. then dont.

Space and stuff is something I havent learned about, didnt bother in school as its for nerds and never bothered after. Im not a big TV watcher of stuff like Science and I dont read at all, as books are boring.

So I get info on things I dont know about from the net, primarily asking questions on forums as I cant be bothered reading articles etc as I just switch off.
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Either Troll, or doesn't know anything.

I'll assume the second for now (and I'm bored, so I may as well write a reply...)

Space=nothing (almost). No gases, just a vacuum.
 
This has got me thinking about a twist on the question.

The heat from the sun is caused by emitted electromagnetic radiation. Space is close to absolute zero. Suppose a heat shield existed which could stop all the radiation to protect a human behind it (like a black body or something) or deflect all the radiation.

In this situation then how close could a human get to the sun? Ie at what point would the suns heat be directly transferred via conduction or convection?
 
The moon can reach 107c in the day light and -153c at night 13earth days per lunar day.

Space is a vacuum and extremely cold, just a few degrees of absolute zero. and isn't anything like air temperature. There's practically nothing in space to hold any heat. However any object will get pounded by photos and other particles from the sun and with out the earth atmosphere to absorb and diffuse the energy heats up very quickly.

Although mars looks red from earth. Its not very red, its more like sun baked ground dust coloured. http://mars.jpl.nasa.gov/msl/multimedia/raw/?s=494&camera=MAST_ The colour has nothing to do with temperature, but iron oxides and other compounds. We know what the temperature of mars is several active rovers and orbiters on it right now, and its cold, due to the greater distance from the sun. Even on mars equator, the hottest part it ranges from 20c to -90c.
Some other temp measures
The temperatures on the two Viking landers, measured at 1.5 meters above the surface, range from + 1° F, ( -17.2° C) to -178° F (-107° C). However, the temperature of the surface at the winter polar caps drop to -225° F, (-143° C) while the warmest soil occasionally reaches +81° F (27° C) as estimated from Viking Orbiter Infrared Thermal Mapper.

In 2004, the Spirit rover recorded the warmest temperature around +5 C and the coldest is -15 Celsius in the Guisev Crater.
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mlbtheshow said:
I dont know why you get funny over it?

Its a genuine question, if its too simple for you to take part in.. then dont.

Space and stuff is something I havent learned about, didnt bother in school as its for nerds and never bothered after. Im not a big TV watcher of stuff like Science and I dont read at all, as books are boring.

So I get info on things I dont know about from the net, primarily asking questions on forums as I cant be bothered reading articles etc as I just switch off.
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Troll/10 - Must try harder.
 
dekez said:
This has got me thinking about a twist on the question.

The heat from the sun is caused by emitted electromagnetic radiation. Space is close to absolute zero. Suppose a heat shield existed which could stop all the radiation to protect a human behind it (like a black body or something) or deflect all the radiation.

In this situation then how close could a human get to the sun? Ie at what point would the suns heat be directly transferred via conduction or convection?
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Again, hopefully a troll, but if not, I feel sorry for you so:

Conduction/convection can only occur when there is something (gas, liquid or solid) to transmit the heat. Therefore for your question, until they touch it.
 
That's my point, in that situation you could in theory get right up to the sun without it burning you. But could you though? Would heat from contact with solar flares / plasma or whatever stop you before then?
 
Glaucus said:
The moon can reach 107c in the day light and -153c at night 13earth days per lunar day.

Space is a vacuum and extremely cold, just a few degrees of absolute zero. and isn't anything like air temperature. There's practically nothing in space to hold any heat. However any object will get pounded by photos and other particles from the sun and with out the earth atmosphere to absorb and diffuse the energy heats up very quickly.

Although mars looks red from earth. Its not very red, its more like sun baked ground dust coloured. http://mars.jpl.nasa.gov/msl/multimedia/raw/?s=494&camera=MAST_ The colour has nothing to do with temperature, but iron oxides and other compounds. We know what the temperature of mars is several active rovers and orbiters on it right now, and its cold, due to the greater distance from the sun. Even on mars equator, the hottest part it ranges from 20c to -90c.
Some other temp measures
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These photos you speak of... are they reflected transmissions from earth?
 
Interesting fact, if and when the ITER experimental fusion reactor in Cadarache, France fires up it will have the steepest temperature gradient in the known universe; going from almost absolute zero (the coldest you can possibly get) at -270C to 10 times the temperature of the suns surface within a distance of 4 metres. Good, eh?

http://www.iter.org/doc/www/content/com/Lists/WebLinks/Attachments/865/ITER - Building - 23.3.12.pdf

Flying close to the sun sounds rubbish when you can (hopefully, someday) suspend a ball of plasma in a tin can and get infinite amounts of energy out of it.
 
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