For this one i used the Layer Presets on Hue/Saturation and Brightness/Contrast

 For this one i used the Hue and Saturation and the mask layer so i could change some of the colors but not all of them,I also used the Brightness/Contrast.

 For this one i used the Levels and the mask so i could change the colors but also keep some of the colors that i didn't want changed.

 For this one i used the Hue/Saturation and Brightness/Contrast i changed the color of the telescope but used a mask so the background wouldn't get changed with the Hue/Saturation.

For this one i used the Photo filter to change the over all coloring to the picture.