Detailed 3D render of a grenade with an inner galaxy. Metallic gray grenade casing, detailed design, with a complex latching mechanism. Inner space filled with vibrant nebulae of swirling, luminous colors, including vibrant pinks, blues, oranges, and purples. Stars and constellations are scattered throughout the nebulae, adding depth and detail. Explosion-like effects are visible, glowing with intense lights. The material of the grenade casing appears smooth and reflective, showcasing high contrast lighting. The style is sci-fi, fantasy, and illustrative with high realism and detail. The composition is focused on the grenade, with a light, clean background. Perspective is slightly angled, allowing for detailed views of the grenade's features. The mood is fantastical, energetic, and intriguing, suggesting an explosion of energy. The overall effect is visually striking, with a sharp focus on the detailed galaxy and metallic grenade. Modern aesthetic; highly detailed illustration.