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And between: “To understand why the brightness of Mars varies so much in the Earth’s sky, we must realize that Mars is not a very large planet, with a diameter of only 6,790 km and unlike Jupiter, the largest planet in our solar system. Jupiter is 140,000 km in diameter, it can be aligned More than 20 Mars-sized planets are side by side in front of Jupiter, so Jupiter always looks bright, because it’s so big, but it’s not the case for small Mars whose luminosity is related to its proximity or distance from Earth.”