The planet that orbits the sun in the fewest number of days is Mercury. Here's why:
1. Mercury is the closest planet to the sun in our solar system.
2. Due to its proximity to the sun, Mercury has a much shorter distance to travel in its orbit compared to other planets.
3. Mercury's orbit around the sun takes about 88 Earth days to complete, making it the fastest planet in terms of orbiting around the sun.
4. This rapid orbit speed is due to Mercury's small size and its proximity to the sun's strong gravitational pull, which causes it to move quickly along its orbit.
In summary, Mercury's close distance to the sun and its small size allow it to complete its orbit in the shortest amount of time compared to other planets in our solar system.
