A planet
Pluto is not a planet because it has not cleared everything from its orbit. The rules of a planet are:It orbits the SunIt is large enough for gravity to squash it into a ballIt must have cleared everything in its orbit (Pluto did not fulfill this).
Planet
The sun's gravity holds the planets in their orbits. It also holds other space objects in their orbits, such as asteroids.
A planetary object is a body that orbits a star (like a planet or a dwarf planet), whereas a moon is a natural satellite that orbits a planetary object. Moons are smaller bodies that orbit planets or dwarf planets.
The type of object that orbits the sun and has cleared the area of its orbit is called a planet. Planets are celestial bodies that orbit the sun, are spherical in shape, and have cleared their orbit of other debris or objects. There are currently eight known planets in our solar system.
That's the modern definition of a planet.
A planet is an object that orbits a star, has enough gravity to make itself mostly round, and has cleared other objects out of its orbit. A satellite is an object that orbits another object that is itself orbiting a star. The object may be a planet, dwarf planet, asteroid, or comet.
A SATELLITE is an object that orbits another object. Natural satellite: the moon Synthetic /artificial satellite: the Hubble space telescope
That would be an object that:* Orbits the Sun * Is in hydrostatic equilibrium (basically this means it has a round shape) * Has NOT cleared its surroundings
The simplest and best answer to that question is: -- Without gravity, there would be no orbits. -- Once you completely understand gravity, you can figure out everything there is to know about orbits, because it all comes from the behavior of gravity.
According to the 2006 definition from the International Astronomical Union, there are three main requirements:it is a celestial object which orbits the Sun (or in the case of exo-planets, orbits another star);it is massive enough so that its own gravity can overcome rigid-body forces and attain a hydrostatic equilibrium shape. That is, it is approximately spherical;it has cleared the neighbourhood around its orbit.
A dwarf planet is a celestial body that orbits the Sun and has enough mass for its gravity to form it into a spherical shape, but has not cleared its orbit of other debris. An asteroid is a small rocky body that orbits the Sun, typically found in the asteroid belt between Mars and Jupiter, and does not have enough mass to be considered a dwarf planet.