As an expert in planetary science, I can tell you that the planet with the shortest day in our solar system is
Jupiter. A day on Jupiter, which is the time it takes for the planet to complete one rotation on its axis, is approximately
9.9 Earth hours. This is quite short compared to Earth's 24-hour day. However, it's important to note that the length of a day can vary depending on where you are on the planet due to its fast rotation speed and the fact that it's a gas giant without a solid surface.
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