Hi Adrian
Congratulations on your first effort through a telescope, your now on that long road of learning.
You have captured a lot of detail there, might I suggest that you try ISO 800 on the 350D next time you shoot, it will cut down a lot of the noise in the shot.
In my opinion, you seem to have brought out the red channel, all the shots I have done, the Spider is a green colour of O111, you will learn how to use the Levels and Curves command in PS I am sure.
You might want to Google up Noiseware, there is a free edition that allows you to remove some of that noise saturation.
Once again, congratulations and well done.
Cheers
JohnG