Simulated transit to scale of some of the planets of the Solar System as seem from far away. Earth with the Moon (center left of the Sun) and Saturn with Titan (center right from the Sun) are show transiting the Sun. Note that Earth and the moons are about the size of many of the sunspots thus making them harder to recognize from the Sun's background. Jupiter (left) and Neptune (right) are also shown to scale but not transiting. CREDIT: PHL @ UPR Arecibo, NASA, A. Fuji.

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