Generate a multi-panel 'Expanding Brain' meme template, designed for adding text overlays. The template should visually represent the progression of ideas from a simple thought to a 'galaxy brain' level. Ensure a consistent, clean, and minimalist aesthetic throughout all panels, making it ideal for meme creation.

*   **Panel 1 (Initial Thought):** Display a standard, anatomically correct human brain with a neutral, basic appearance.
*   **Panel 2 (Developing Insight):** Show the same brain, slightly larger and more illuminated, with a subtle, internal glow indicating an emerging idea.
*   **Panel 3 (Enlightened Idea):** Depict the brain significantly larger and brighter, radiating a clear, focused light or energy, symbolizing a profound understanding or 'big idea'.
*   **Panel 4 (Cosmic Revelation):** Illustrate the brain as a vast, cosmic entity, seamlessly integrated with swirling galaxies, stars, and nebulae, glowing intensely with celestial energy, representing the ultimate 'galaxy brain' level.

Each panel should be distinct and clearly show the visual progression, maintaining a uniform, light-colored background (e.g., plain white or light grey) to facilitate easy text placement.