Here’s a revised color palette that aligns closely with the previous colors while still incorporating darker shades for the yellow:

json
{
  "palette_name": "Stellar Shadows",
  "colors": [
    {
      "name": "Galactic Purple",
      "hex_code": "
                            
                            #4A1C6E
                        "
    },
    {
      "name": "Nebula Blue",
      "hex_code": "
                            
                            #181C32
                        "
    },
    {
      "name": "Golden Amber",
      "hex_code": "
                            
                            #8B5B00
                        "
    }
  ]
}

In this palette, “Galactic Purple” and “Nebula Blue” maintain the deep tones you were interested in, while “Golden Amber” provides a darker, muted yellow that fits well within the astronomy theme.

Would you like to adjust any specific colors further or explore different combinations?