Which planet has the longest day and night cycle?
Venus, the second planet from the Sun, has the longest day and night cycle among the planets in our solar system. It takes approximately 243 Earth days for Venus to complete one rotation on its axis, resulting in an incredibly long day. This extended day is even longer than Venus's year, which takes around 225 Earth days to orbit the Sun. As a result of having such a slow rotation, days on Venus are much longer than its nights, making it the planet with the longest day and night cycle.
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