How do planets vary in size?

The planets of the solar system vary in size. The terrestrial planets (Mercury, Venus, Earth, Mars) are composed of solid matter and are small in size. Giant planets with gas and dust composition are huge.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.