"Infinity" <[Only registered users see links. ].Think.About.It> wrote in message
news:dVLpf.6399$[Only registered users see links. ].pas.earthl ink.net...
'Temperature' is a measure of the average kinetic energy of a collection of
particles. It is usually applied to matter. Most stars are not
homogeneous, and the surface temperature will vary with the size and age of
the star as well as the 'weather' (such as sunspots).
Stars will be hotter on the inside, and the deeper one probes the higher the
temperature. That is because temperature increases with pressure, and
pressure increases with depth. [Only registered users see links. ]
Our sun has a surface temperature of about 6000 Kelvins, but to even begin
fusing hydrogen into helium (the source of most starlight) takes
temperatures of 10 million Kelvins.
When the abundance of photons of all energies is well known it is possible
to calculate the average energy of the photon and determine the
'temperature' of the light. In practice this concept is only approximate and
mainly of interest to photographers.
Bottom line: galaxies don't have a temperature.
Most stars were probably formed at the same time (or later) as the galaxies
in which they participate. Some (but very few) may form in the space
between the galaxies, or may get stolen from another galaxy in a close
encounter. Most stars seem to continue orbiting the galaxy throughout their
natural lives, ending as dwarf stars or novas. Some few are destroyed in
collisions with other stars or black holes.
It stops 'absorbing' stars and has to be satisfied with the ones its already
I don't think you'll be happy with the answers I have given you, but your
questions betray your lack of understanding of the subject matter.
I think you need to study a little more on your own before you can even ask
the right questions.
Try this: [Only registered users see links. ]
There are embedded links to other articles which can answer more questions
as you think of them.