Here's why:
* Rotation: All planets in our solar system rotate on their axis. This rotation is what causes day and night. Even if a planet has a very slow rotation, the sun will still appear to rise and set from the perspective of someone on that planet's surface.
* Orbit: Planets also orbit the sun. This orbit means that the sun's position relative to a planet changes over time. Even if a planet had a very long day, the sun would still move across the sky due to its orbital motion.
The closest thing to a planet where the sun doesn't rise and set would be:
* A planet tidally locked to its star. In this scenario, one side of the planet always faces the star, while the other side always faces away. This would mean that one side of the planet experiences perpetual day, while the other side experiences perpetual night. However, even in this case, the "sun" would still move across the sky due to the planet's orbital motion.
So, while there isn't a planet where the sun doesn't rise and set in the traditional sense, the idea of a tidally locked planet is a fascinating concept that helps us understand how celestial bodies can interact with each other.
