What are the main properties of a planet?

According to the IAU, a planet must fulfill three requirements:

What unites them is that they are all circular or oval in shape, have a core, and each rotates on its own axis while revolving around the Sun.

Mercury: Due to its close proximity to the sun, its cratered surface experiences temperatures as high as 426.7 degrees Celsius; however, the side of the planet facing away from the sun experiences much lower temperatures, at 173 degrees Celsius.

Venus: The planet's heat and pressure render it uninhabitable for life due to its dense atmosphere, which results in air pressure at the surface that is 90 times greater than that of Earth.

Earth is the only planet known to support life and is where we call home.

Mars: Mostly composed of rocks, it appears red in color and is frequently hit by wind storms that sweep across the entire planet.

Jupiter is a gas giant planet that is the largest in the solar system and is referred to as the king of the planets.

Saturn is surrounded by a large number of asteroids that give the impression of being rings.

Uranus appears to slide on its axis because it spins on an axis parallel to its orbit.

Neptune: Owing to its erratic revolution, it occasionally overtakes Earth as the planet with the furthest distance.

The main properties of a planet include being spherical due to gravitational forces, orbiting a star, having cleared its orbit of debris, and not being a satellite of another celestial body.