Megan Zoe Wilson, via Facebook asked:
Why is it cold in Space when the Sun is hundreds of thousands of degrees C?
Dave - The Sun is incredibly hot, but the Sun is not throughout the whole of space. So, when you're sitting in space, in the Earth’s orbit, you're getting hit by about the same amount of sun that you get if you're sitting on Earth, but the rest of you can see deep dark space which is about -270 degrees centigrade. So, you radiate heat into the deep dark space because anything warm glows in the infrared; and you're getting hit by sunlight, and the balance of those two is the temperature you’ll sit at. In the Earth’s orbit I think it’s a bit below 0 degrees centigrade.
I think because there is no atmosphere. Warm it is something transmission between particles of the air (not necessarily particles of the air that can be anything between water and metal or anything what have got skill transmission heat) who move and collide and transmission energy or heat. If we have got no atmosphere in a space so we have got no move, no collide, no energy and heat. juhuhu., Fri, 25th Feb 2011
Yep, I think you caught it juhuhu. Temperature is when something 'jiggles'. The more the molecules and atoms 'jiggle' the hotter we should find it. In space we don't have anything that can 'jiggle', or at least very little.
The sun is a very large mass of matter which interacts with itself to produce nuclear reactions but space has become so stretched since the big bang that the energy in it has also been stretched so that it is now 'diluted' and weak and therefore colder. abacus9900, Sun, 27th Feb 2011
Juhuhu, sorry, that can't be technically correct. if space is a vacuum, without particles to transfer heat. How does heat get from the sun to Earth.
Heat is radiated from the sun primarily with light. As the sun is very hot, the radiated light is primarily in the UV and visible spectra.
Space is neither hot nor cold, because it is literally nothing. Temperature is the mean energy of molecules: no molecules, no temperature!
True. alancalverd, Thu, 11th Jul 2013