Craft an immersive digital illustration of a silver holographic universe depicted in the form of a round spiral, with a shiny silver planet nestled at its center. Use a combination of digital painting techniques and special effects to create the spiral shape, with holographic stars and galaxies swirling around the central planet. The holographic effect should give the impression of depth and movement, with colors shimmering and shifting along the curvature of the spiral. Pay careful attention to the central planet, rendering it with a highly reflective silver surface that catches the light and reflects the surrounding holographic colors. Experiment with composition and lighting to create a sense of ambiance and wonder, drawing the viewer into the captivating beauty of the silver holographic spiral universe.