What is the temperature out side a solar system?
Anyone know what the temperature is out side a solar system?
This is for homework too.
Q1: It depends.
Firstly, one has to be careful about terminology.
Where does our Solar System 'end'?
Is it the orbit of Pluto?
The Edgeworth-Kuiper belt?
Perhaps the magnetopause?
All of these are equally valid ways to mark the edge of the Solar System, but all of these regions lie at different distances from the Sun and have different densities.
Densities?
Yes. Space is not a perfect vacuum. A tenuous mist of elementary particles and quanta pervades all space. The density and temperature of this low-density gas depends on where you are and what's around you.
At the very low densities of interstellar space (midway between stars, say) then it is not really meaningful to speak of temperature - temperature is a measure of how heat is concentrated in an object - the particles in deep space are so few and far between that they are essentially unconnected.
A cosmic ray particle, for example, can travel light years without being scattered. So if one were to be struck by such a particle (and they can deliver a fair amount of energy) would you class this as part of the local environment, or as something from further away?
For dense objects that *can* have a meaningful temperature, well, we know the temperatures (from microwave and deep infra-red observations) of many objects such as gas clouds, that lie far beyond our Solar System.
I suggest a little research may answer some of your questions:
http://www.astrophysicsspectator.com/topics/milkyway/InterstellarMedium.html
and
http://www.astrophysicsspectator.com/topics/milkyway/InterstellarMediumTwoPhase.html
Oh, and if you get stuck, there's wikipedia and Google - both invaluable resources.
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