Difficult 20x20 676 pieces Messier 87 Black Hole Jigsaw Puzzle
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The black hole jigsaw puzzle. This challenging and fun astronomy photo puzzle features the supermassive black hole at the core of supergiant elliptical galaxy Messier 87 as seen in the first ever black hole image captured by the Event Horizon Telescope. We wouldn't call it the hardest or evil, but this puzzle will challenge anyone. Makes a great gift for astronomy and astro photography fans who enjoy solving hard jigsaw puzzles.