The planet with the shortest day is Jupiter. It completes a full rotation on its axis in about 10 hours, making its days much shorter compared to Earth’s 24-hour cycle. Jupiter's rapid rotation contributes to its distinctive shape, which is slightly flattened at the poles and bulging at the equator. This gas giant is known for its dynamic weather patterns, including the famous Great Red Spot, a massive storm that has been raging for over 350 years. Jupiter's size and density also contribute to its strong gravitational pull, affecting its numerous moons.