Generate a 50x50 grounded Minecraft...

Generate a 50x50 grounded Minecraft spawn for Astroverse: a circular 3-tier celestial observatory built on the ground with blackstone, deepslate, gold trim, blue glass, glowing lanterns, and nebula crystal accents. Place a large telescope on the upper level aimed through a giant ancient cosmic portal ring behind the building, filled with a swirling galaxy effect in blue, purple, and white. Make the spawn compact, symmetrical, premium, easy to navigate, and designed for a polished Cobblemon server hub. Include a central entry path, clean plaza, small NPC areas, portal/guide spaces, crystals, and subtle landscaping. No floating islands, no oversized empty space, no rustic medieval theme.