Let’s create a color palette with even darker shades that fit an astronomy theme, evoking the vastness of space while still including purple and blue tones along with a bright accent color:

json
{
  "palette_name": "Cosmic Night",
  "colors": [
    {
      "name": "Galactic Purple",
      "hex_code": "
                            
                            #3F1A47
                        "
    },
    {
      "name": "Deep Space Blue",
      "hex_code": "
                            
                            #1A1A4B
                        "
    },
    {
      "name": "Starburst Yellow",
      "hex_code": "
                            
                            #FFEA00
                        "
    }
  ]
}

In this palette, “Galactic Purple” and “Deep Space Blue” depict the dark depths of the universe, while “Starburst Yellow” represents the brilliant light of stars, providing a striking contrast suitable for an astronomy theme.

Would you like any additional changes or other themes explored?