Earth is a planet that orbits the sun.

Planetary sciences is a very interesting subject.

Planetology is a scientific field that deals with the formation, structure, and evolution of planets.

I want to learn about planetary science.

Mercury is one of the inner planets closest to the Sun.

Outer planets are located in the outer regions of the Solar System.

Minor planets orbit around the Sun.

Pluto has been classified as a dwarf planet.

The discovery of exoplanets has sparked great interest in the field of astronomy.

New technologies are being used to discover exoplanets.