Black and white sticker illustration in bold outline style, three classic gray aliens with oversized bald heads and large almond-shaped black eyes reading books on the lunar surface, center alien holding an open book with cosmic symbols floating out of pages, left alien lying on a giant mushroom cap reading upside down, right alien sitting cross-legged on a mushroom stool with a stack of books beside, giant cratered full moon in background with crescent shape, tall spotted mushrooms growing like bookshelves, floating tiny stars and book pages, cratered moon ground with scattered books, starry night sky with sparkle stars, thick clean black linework, high contrast, no shading, sticker die-cut white border, flat 2D vector style, whimsical cosmic library vibe.