Now you're well-versed in the process of taking night photographs and editing them, you will begin to know what looks right and wrong.
White balance is somewhat of an art to get right, and it's worth experimenting a bit. While we'd usually recommend setting your white balance to a slightly cooler temperature for astro shots, use the manual white balance settings or the presets to create interesting tints and variations to your shots. There's no rule. Now you're well-versed in the process of taking night photographs and editing them, you will begin to know what looks right and wrong.